AP & Spend Automation3 min readUpdated September 2026

BILL vs Tipalti for Custom Software and Product Engineering Shops

For a software development shop, BILL fits domestic contractors and vendors, while Tipalti fits firms paying overseas engineers who bill by milestone or by hour. The biggest payables line is usually the engineers themselves, so the tool has to handle milestone invoices and, for global teams, currency and tax questions without slowing payment.

That second workflow is where BILL and Tipalti pull apart, and where picking wrong shows up first as slow milestone payments and frustrated contractors who start asking whether they should be prioritizing a client that pays faster.

Vendors Covered in this Article

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Two very different payables problems under one roof

Tool and vendor bills, cloud services, project management software, office overhead, look like standard AP: a stable vendor list, monthly invoices, predictable approvals. Contractor and subcontractor engineer payments look different: milestone-based invoices that don't arrive on a fixed schedule, project managers who need to approve hours or deliverables before payment, and, for firms that staff overseas talent, currency and tax questions that a domestic bill-pay tool wasn't built to answer.

BILL for the vendor side, and for domestic-only shops

If your firm staffs projects entirely with US-based contractors and W-2 employees, BILL's approval routing and bill capture cover both the vendor list and the contractor payments without much friction. It's a reasonable single tool when the whole payables workload, tools and people, sits inside one country and one currency, and it keeps the accounting sync simple because there's no currency translation to reconcile, and no tax-treaty question to research before a payment can go out.

When does Tipalti fit a firm with global engineering talent?

Once a firm regularly pays contractors or subcontracted development shops outside the US, the questions multiply: which country, which currency, which tax form, and how does a project manager approve a milestone invoice from someone they've never met in person. Tipalti's payee onboarding portal puts that verification burden on the payee instead of your finance team, and its multi-currency payment rails avoid the wire-fee-and-spread math that comes with routing every overseas payment through a domestic bank, one project at a time.

How to size the decision without guessing

Pull last quarter's contractor and subcontractor payment list and sort it by country. If it's overwhelmingly domestic, BILL is the lower-friction choice. If a meaningful share of your engineering spend already goes overseas, or your growth plan depends on hiring where the talent is cheaper or more available, the setup cost of Tipalti is worth absorbing before your project managers are stuck manually calculating wire fees on every milestone payment, a habit that rarely goes away once it starts.

What changes once you bill clients for the same work

Development shops that rebill client engagements for contractor time have an extra reason to get this right: a delayed or mishandled contractor payment doesn't just annoy the contractor, it can hold up the client invoice behind it if your billing process is tied to confirmed payment. Whichever tool you choose, confirm that a contractor's approved milestone flows cleanly into whatever you use to invoice the client, so the two processes don't drift apart over time.

A worked example: a mixed onshore and offshore team

Say a project has three domestic contractors and two contractors based overseas, all billing monthly on the same milestone schedule. In a domestic-only setup, finance ends up running two processes in parallel: standard bill pay for the three domestic invoices, and a manual international wire, with its own currency lookup and fee calculation, for the other two. That split isn't a huge burden on one project, but it compounds fast once a firm is staffing five or six projects the same way, which is usually the point where consolidating onto a platform built for both payee types starts saving real hours every month.

Which questions should you settle before picking a tool?

Ask where your engineering talent is actually sourced today, not where it was two years ago when the firm was smaller and entirely local. Ask whether project managers are comfortable approving an invoice from a contractor in a different time zone with the same confidence they'd approve one from someone down the hall, and if not, what documentation would change that. Ask how contractor payment delays have actually affected project margins or contractor retention in the last year, since a specialist who's paid late by a clunky manual process is a specialist who takes the next project elsewhere, and replacing a mid-project contributor costs far more than any AP tool does.

Settle these questions before you pick a tool:

  • Where is your engineering talent actually sourced today, rather than where it was when the firm was smaller and entirely local?
  • Are project managers confident approving an invoice from a contractor in a different time zone, and what documentation would raise that confidence?
  • How does an approved contractor milestone flow into client billing, especially when client invoices depend on confirmed payment?
  • What share of engineering spend already goes overseas, and does your growth plan depend on hiring where talent is cheaper or more available?
Executive Capability Standard

What Good Looks Like

A development firm's finance function can route a milestone invoice to the project manager who actually knows whether the work was delivered, and pay a contractor in their own currency without someone manually working out a wire transfer.

Building The Capability (5-Stage Skill Ladder)

1. Learn:Understand what changes about a payment when a contractor is overseas: currency conversion, local tax withholding questions, and the difference between a wire and a payout-network transfer.
2. Do Manually:Track one full cycle of contractor milestone invoices in a spreadsheet, noting who approved what and when payment actually went out, to see where delays creep in.
3. Delegate:Give project managers direct approval authority on milestone invoices within a defined dollar threshold, so finance isn't the bottleneck on routine payments.
4. Automate:Set up standard approval routing by project and by contractor type, so a recurring milestone invoice from an approved contractor clears without a fresh manual review each time.
5. Buy:Move overseas contractor payments onto a platform built for it, like Tipalti, once wire fees and manual currency math are eating into project margins.

How to Get Started

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Frequently Asked Questions

Can BILL handle milestone-based contractor invoices?

Yes, BILL can capture and route an irregular invoice just like a recurring one, with approval steps a project manager signs off on before payment. The gap shows up with overseas contractors, where currency conversion and tax documentation aren't its focus.

Is Tipalti overkill for a small development shop with a few contractors?

If those contractors are all domestic, probably. Tipalti's advantage is payee self-onboarding and multi-currency payment rails, which matter most once your contractor base spans multiple countries.

How do project managers fit into the approval workflow either way?

Both tools support multi-step approval, so a project manager can sign off on a milestone or a set of hours before an invoice moves to payment. The difference is what happens before that approval step: domestic contractor onboarding is simple in either tool, while overseas payee verification is where Tipalti does more of the work automatically.

About the numbers

This guide doesn't quote a sourced benchmark. Figures in it are estimates or general guidance, so check them against your own numbers.

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