When does a business need custom payroll software instead of Gusto, ADP, or Rippling?

Off-the-shelf platforms work well for standard employee structures and single-jurisdiction payrolls. Custom becomes the right choice in four situations. Your pay rules can't be expressed in the platform's configuration layer. Contractor and employee payments need to run through the same system with different tax treatment. You're building a payroll product to sell to other businesses rather than using it internally. Or multi-country filing requirements exceed what your current provider covers. The trigger is usually a compliance gap, a manual workaround that runs every pay period, or a product vision the platform's API can't support.

Can you build payroll software that handles multi-state and international tax compliance?

Yes. We build payroll systems with jurisdiction-specific tax engines that handle state income tax, FICA, FUTA, SUTA, and international payroll obligations across the UK, Australia, Canada, and other markets. The tax logic is configured to your employee footprint and updates when rates or filing requirements change. Audit-ready reports and jurisdiction-level filings are included.

Can you build both payroll and expense management into the same platform?

Yes. We build unified platforms where employees submit expenses through a mobile app or web portal, approvals route to the right manager automatically, and reimbursements process through the same payroll run or as a separate payment cycle. Receipt capture, mileage calculation, policy compliance checks, and accounting integrations with QuickBooks or Xero are all standard capability areas we cover.

How long does payroll software development take and what does it cost?

A focused payroll automation engine or expense management workflow launches as a validated v1 in about 10 to 14 weeks. We scope every project before pricing. A full payroll platform covering multi-jurisdiction compliance, expense management, contractor payments, and HRIS integrations is a larger workforce build, so it gets scoped separately after discovery. Fixed cost is agreed before development starts.

Can the payroll software integrate with our existing HRIS, accounting, and time-tracking tools?

Yes. We integrate with Workday, BambooHR, HiBob, Rippling, QuickBooks, Xero, NetSuite, Sage, and common time-tracking platforms like Deputy and When I Work. The integration approach depends on what APIs are available and whether data needs to flow in real time or in scheduled batches. We map the integration landscape during discovery and build the connectors that remove manual data transfer from your payroll process.

We've run payroll on the old system for years. What happens if the first run is wrong?

That is the fear that keeps payroll migrations stuck. We run parallel payrolls alongside your existing process for the first one or two pay periods, so discrepancies surface before the cutover, not after. Every calculation is validated against your historical data before go-live. Adding a state isn't instant either: registrations like the CA EDD take 10 to 15 business days, so we build the real lead times into the plan instead of promising day-one paychecks. The first live run is the least surprising run, not the most.

Payroll Software Development Company

One founder's rule for benefits and payroll: do not make me look like an ass in front of my employees. If they don't get paid, employees give exactly zero shits about which company failed and where and why. They only know they didn't get paid, and the blame lands on the founder.

Payroll automation engines that calculate gross-to-net pay, apply your specific deduction rules, and close each run without a manual review queue
Multi-jurisdiction tax compliance with state, federal, and international filing logic built for your exact employee footprint
Expense submission, approval workflows, and reimbursement processing in one system connected to your payroll cycle
Contractor and 1099 payment workflows with automatic tax document generation and year-end filing support

The problem

Sound familiar?

Running payroll across multiple states or countries and spending days each period reconciling tax rates, filing deadlines, and jurisdiction-specific deductions by hand?
Employees submitting expenses through email or spreadsheets, with approvals that take longer than the reimbursement itself?
Your payroll platform handles the standard cases but forces manual workarounds every time a contractor, part-timer, or multi-role employee appears on the run?

Short answer

RaftLabs handles payroll software development for HR-tech startups, professional employer organizations, and global payroll platforms that have outgrown Gusto, ADP, or Rippling. We build payroll automation engines, multi-jurisdiction tax compliance, contractor payments, expense management, and HRIS integrations. A focused payroll engine launches as a validated v1 in about 10 to 14 weeks; full platforms are scoped separately.

Trusted by

01 Diagnosis

Where payroll actually breaks

01
Problem
Do not make me look like an ass in front of my employees
Solution
That is one founder's only rule for benefits and payroll. If employees don't get paid or lapse in coverage, the founder looks like an ass, and employees give exactly zero shits about which company failed and where and why. Yet teams still run multi-jurisdiction payroll off a spreadsheet someone updates by hand every time a rate changes or a hire lands in a new state. A single missed deposit is expensive: the IRS failure-to-deposit penalty escalates from 2% of the underpayment when a deposit is 1 to 5 days late up to 15% once a notice goes unanswered.A payroll engine with jurisdiction-specific tax logic built in calculates the correct withholdings automatically, flags exceptions before the run closes, and generates the filing reports each jurisdiction requires. The spreadsheet and the manual update cycle disappear. The outcome is a pay run that never makes the founder look bad.
02
Problem
The tool assumes an HR person who does not exist in the company
Solution
Small teams do not fail at HR software because they picked a tool with too few features. They fail because the tool assumed an HR person who doesn't exist in the company. Employees submit receipts by email. Managers approve by replying to a chain. Someone on the finance team copies the amounts into the payroll system. The reimbursement either misses the current payroll run or gets processed as a separate bank transfer nobody can track.When expense submission, approval routing, and reimbursement processing run inside the same platform as payroll, the cycle compresses from days to hours. Receipts attach at submission. Approvals trigger automatically based on amount and category. Finance has one export to reconcile instead of four sources to collate. The outcome is expenses that don't need an HR department.
03
Problem
Everything's integrated until it isn't
Solution
When everything runs through one integrated suite, even updating an employee's personal info can get tricky. It's not always clear what changes automatically and what doesn't, so you end up digging into each system to figure out what still needs doing. Contractors get worse treatment: most platforms treat them as an afterthought, paid through a separate bank transfer and tracked in a spreadsheet until year-end, when someone has to produce 1099-NEC forms for every contractor who crossed the $600 threshold.A payroll system built to handle both employee and contractor payments within the same run eliminates the parallel process. Contractor payments calculate against agreed rates, apply the correct tax treatment, generate 1099-NEC documentation automatically, and post to accounting the same way employee payroll does. Year-end closes in hours rather than days. The outcome is one run for everyone on it.
04
Problem
What the bill looks like in month thirteen
Solution
Payroll platforms sell on the starter price and bill on the renewal. Modules sold separately, per-feature add-ons, EOR fees that start at $599 per contractor per month, and module-creep at renewal mean the bill in month thirteen is the real question. New hire starts on Monday, HR adds them to the HRIS on Tuesday, and payroll doesn't see the record until someone exports a CSV and imports it on Thursday. A field formats differently and the import fails. By Friday, the new hire is missing from the run.When the HRIS and payroll share a data model and sync in real time, new hire records, role changes, terminations, benefit elections, and time-off balances flow into payroll automatically. Fixed cost is agreed before development starts, so there is no month-thirteen surprise. The outcome is payroll priced once, not renegotiated annually.

02 What we ship

Payroll software we build

Payroll automation engines
We build gross-to-net payroll calculation engines that apply your specific pay rules: regular and overtime rates, shift differentials, bonus structures, garnishments, pre-tax benefit deductions, and post-tax deductions. The engine handles W-2 employees and 1099 contractors in the same run, applies jurisdiction-specific tax tables automatically, and produces a pre-close review screen before any payments process.
Pay rules that can't be expressed in a SaaS configuration layer are the primary reason businesses commission custom payroll development. We model your exact rules and test them against historical payroll data before go-live so the first live run doesn't surface surprises.
Built for HR-tech startups building a payroll product, PEOs running payroll for clients with non-standard workforce structures, and businesses replacing a manual payroll process that has outgrown a spreadsheet.
Multi-jurisdiction tax compliance
We build jurisdiction-specific tax engines. They handle US federal, state, and local withholding, FICA and FUTA obligations, and SUTA across multiple states. They also handle international payroll tax obligations for the UK, Australia, Canada, Ireland, and other markets. Tax tables update when rates change. Filing reports generate in the format each jurisdiction requires.
Year-end close covers W-2 production, state reconciliation filings, and 1099-NEC generation for contractors. Audit logs record every calculation so your tax team can reconstruct any pay period from the data in the system.
Built for companies with employees in 5+ states, global payroll platforms supporting international workforces, and PEOs responsible for tax compliance on behalf of their clients.
Expense management and approvals
We build expense management platforms where employees submit receipts through a mobile app or web portal. Approval workflows route to the correct manager based on amount, category, and cost center. Reimbursements process through the payroll cycle or as scheduled off-cycle payments. Receipt capture uses OCR to extract merchant, amount, and date so employees don't type what a photo already shows. Mileage tracking calculates against current IRS or HMRC rates automatically.
Policy compliance rules flag out-of-policy submissions before they reach the approver rather than after the payment has already processed. Accounting integrations with QuickBooks, Xero, NetSuite, and Sage post approved expenses to the correct GL account without a manual journal entry.
Built for businesses replacing an email-and-spreadsheet expense process, companies that want reimbursements visible inside the payroll system rather than managed separately, and finance teams that need a clean audit trail for expense claims.
Contractor and gig worker payments
We build contractor payment platforms that handle the full lifecycle. Onboarding collects the W-9 or W-8BEN. Payments calculate against agreed rates or milestone invoices. Tax documents (1099-NEC, 1042-S) generate at year-end. Disbursement goes via ACH, wire, or international transfer through Stripe or Wise.
For platforms with a large contractor population, we add self-service portals where contractors submit invoices, track payment status, and download their tax documents without contacting the finance team. For marketplaces and gig platforms, contractor payouts can trigger automatically from completion events in your product rather than requiring a manual payment run.
Built for businesses with more than 20 contractors on regular payment cycles, marketplaces and gig platforms paying large worker pools, and global payroll platforms supporting cross-border contractor payments.
HRIS and time-tracking integrations
We build payroll integrations with Workday, BambooHR, HiBob, Rippling, Gusto, ADP, Deputy, When I Work, and custom HRIS platforms so that employee records, role changes, terminations, benefit elections, and approved timesheets flow into payroll automatically. The integration removes the manual export, reformat, and import cycle that creates data mismatches between systems.
Where a direct API connection exists, data syncs in real time. Where it doesn't, we build a scheduled sync with validation rules that flag discrepancies before the payroll run rather than after. Change history logs every field-level update so your HR and payroll teams can see exactly what changed, when, and from which system.
Built for businesses replacing a manual CSV handoff between HRIS and payroll, companies that need payroll data to flow upstream into workforce analytics tools, and HR-tech platforms building a connected employee data layer.
PEO and white-label payroll platforms
We build multi-tenant payroll platforms for professional employer organizations and HR-tech businesses that run payroll on behalf of their clients. Each client gets an isolated data environment, configurable pay rules, and jurisdiction-specific tax logic that reflects their employee footprint rather than a shared average. The PEO's operations team manages all clients from a single admin console with bulk processing, cross-client reporting, and per-client audit trails.
White-label packaging means the platform carries your brand, not ours. API-first architecture lets you embed payroll processing into a broader HR or workforce management product without rebuilding the core payroll engine. The architecture is multi-tenant from the start, so adding client businesses doesn't require re-platforming.
Built for PEOs replacing a legacy payroll platform, HR-tech startups launching a payroll product, and benefits administrators who need to add payroll to their existing service offering.

03 Buy, build, or wait

The payroll question is really about who absorbs the blame.

Stay on the platform

Gusto/ADP, while it fits
Standard employee structures in one or two jurisdictions, where the configuration layer covers your pay rules.
Deel/Remote, as EOR
Cross-border hiring before you have entities, when per-contractor EOR fees beat building.

Build custom

When the bill surprises you
Module-creep at renewal, per-feature add-ons, $599 per contractor per month. The bill in month thirteen is the real question.
When the rules don't fit
Pay rules that can't be expressed in a configuration layer, contractor and employee runs that need one system.
When payroll is the product
PEOs and HR-tech startups selling payroll to their clients need infrastructure, not a vendor dependency.

Bottom line

Stay on the platform while the configuration layer covers your pay rules. Build when the workarounds, the bill, or the product vision stop fitting.

04 How we work

How we build payroll software

01
Discovery
We map your current payroll process end to end: pay rules, workforce structure, jurisdiction footprint, benefit deductions, contractor mix, and the systems payroll currently touches. We identify where manual steps create compliance risk or operational drag, and which of those can be removed with the right data model. Scope is agreed and a fixed-price specification is produced before development begins. The risk this retires: the pay rule the spreadsheet hid.
02
Design
We design the payroll data model around your specific workforce: the employee and contractor record structure, the pay rule engine, the tax calculation logic, the approval workflow, and the integration points. Compliance obligations, FLSA overtime rules, state-specific requirements, and audit trail requirements are factored into the architecture before any code is written. Payroll holds some of the most sensitive data you keep: bank details, Social Security numbers, and compensation. We build with encryption in transit and at rest, role-based access, and a log of who read or changed each record. You see the design as a working prototype before we move to build. The risk this retires: the compliance gap.
03
Build
Two-week cycles with working software at each checkpoint. The core payroll calculation engine and tax logic ship first so you can validate accuracy against historical data. Expense workflows, contractor payment handling, integrations, and self-service employee portals follow in subsequent cycles. Every calculation is tested against your actual pay scenarios, not synthetic test data. The risk this retires: the first-run surprise.
04
Launch and support
We run parallel payrolls alongside your existing process for the first one or two pay periods so discrepancies surface before the cutover, not after. Post-launch support covers regulatory updates, integration changes when third-party APIs update, and product iterations as your workforce grows or your payroll product evolves. The risk this retires: the cutover that misses a paycheck.

05 Track record

What payroll software clients get when they work with us

Weeks to launch a validated payroll v1, then iterate: 10-14

Shipping production software for HR-tech, fintech, and workforce platforms: Since 2015

Cost agreed before development starts: Fixed

08 Why us

Why choose us?

01
We've seen your problem before
Across dozens of industries, we recognise your situation fast, then frame the fix around your margin and your operations, not a generic template.
02
We own the number, not the ticket
We measure success the way you do: hours saved, revenue earned, margin recovered. We stay through launch and growth, so the result is ours to own.
03
Serious businesses trust us
Vodafone, T-Mobile, Cisco, Energia, Aldi, Nike. Building since 2015. Serious businesses keep coming back because we stay accountable long after launch.

09 Questions

Common questions

: Off-the-shelf platforms work well for standard employee structures and single-jurisdiction payrolls. Custom becomes the right choice in four situations. Your pay rules can't be expressed in the platform's configuration layer. Contractor and employee payments need to run through the same system with different tax treatment. You're building a payroll product to sell to other businesses rather than using it internally. Or multi-country filing requirements exceed what your current provider covers. The trigger is usually a compliance gap, a manual workaround that runs every pay period, or a product vision the platform's API can't support.
: Yes. We build payroll systems with jurisdiction-specific tax engines that handle state income tax, FICA, FUTA, SUTA, and international payroll obligations across the UK, Australia, Canada, and other markets. The tax logic is configured to your employee footprint and updates when rates or filing requirements change. Audit-ready reports and jurisdiction-level filings are included.
: Yes. We build unified platforms where employees submit expenses through a mobile app or web portal, approvals route to the right manager automatically, and reimbursements process through the same payroll run or as a separate payment cycle. Receipt capture, mileage calculation, policy compliance checks, and accounting integrations with QuickBooks or Xero are all capability areas we cover.
: A focused payroll automation engine or expense management workflow launches as a validated v1 in about 10 to 14 weeks. We scope every project before pricing. A full payroll platform covering multi-jurisdiction compliance, expense management, contractor payments, and HRIS integrations is a larger workforce build, so it gets scoped separately after discovery. Fixed cost is agreed before development starts.
: Yes. We integrate with Workday, BambooHR, HiBob, Rippling, QuickBooks, Xero, NetSuite, Sage, and common time-tracking platforms like Deputy and When I Work. The integration approach depends on what APIs are available and whether data needs to flow in real time or in scheduled batches. We map the integration landscape during discovery and build the connectors that remove manual data transfer from your payroll process.
: That is the fear that keeps payroll migrations stuck. We run parallel payrolls alongside your existing process for the first one or two pay periods, so discrepancies surface before the cutover, not after. Every calculation is validated against your historical data before go-live. Adding a state isn't instant either: registrations like the CA EDD take 10 to 15 business days, so we build the real lead times into the plan instead of promising day-one paychecks. The first live run is the least surprising run, not the most.

Payroll software by product

Get a build-vs-Gusto plan for your payroll operation

Tell us your pay rules, your jurisdiction footprint, and where the manual work sits. We'll tell you what we'd build, what it costs, and what stays where it is.

Scope and cost agreed before work starts. No surprises. No obligation.
Working prototype within 3 weeks of kickoff.
Pay by milestone. You see progress before each invoice.
60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
All conversations are NDA-protected.

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