Paying Serbian Contractors from a US Company: No-Treaty Guide

Why this guide exists

Serbia is one of Europe’s fastest-growing developer markets, with a deep pool of engineers in Belgrade, Novi Sad, and Nis, strong English, and rates well below Western Europe. US companies hiring nearshore-to-EU talent increasingly look at Serbia, and the freelancer ecosystem there is mature and used to invoicing foreign clients.

But Serbia has one feature that changes the analysis compared with EU markets like Poland or Portugal: there is no US-Serbia income tax treaty in force. That is the single most important fact in this guide. It does not stop you from paying a Serbian contractor cleanly, but it changes what the W-8BEN does for you and removes any treaty-reduced withholding fallback. The other recent change is good news: Serbia joined SEPA in 2025, which makes EUR payouts cheaper.

This guide covers what a US company needs to pay Serbian contractors. We cover the US side (W-8BEN, the no-treaty position, source of income), the Serbia side (preduzetnik, the pausalac regime, PIB, the Poreska uprava, PDV, the independence test), and the payment rail decision. If you want to skip the assembly and let a platform handle it, Omnivoo Contract Management handles SOW drafting, W-8BEN collection, invoice capture, and payout for a flat $49 per contract.

US side: what you need to do as the payer

Step 1. Collect a W-8BEN before the first payment

Before any invoice is paid, the Serbian contractor must complete Form W-8BEN and return it to you. The form certifies the contractor is the beneficial owner of the income, is a tax resident of Serbia, and is not a US person. The IRS Form W-8BEN page has the current form and instructions.

The W-8BEN matters even though there is no treaty. Its job here is to document the contractor’s foreign status, which is what lets you treat services performed in Serbia as foreign source income and pay without US withholding. What changes with no treaty is Part II: the treaty-claim section is left blank, because there is no treaty country to cite and no reduced rate to claim. If your contractor operates through a Serbian company (a d.o.o. or similar), the form is Form W-8BEN-E, the entity equivalent, available on the IRS W-8BEN-E page. The W-8BEN is valid for three calendar years after signature. Not sure the form is filled in correctly? Our W-8BEN checklist walks through what to verify.

Step 2. Confirm the work is performed in Serbia

Under IRS source of income rules for personal services, services income is sourced to the place where the services are physically performed. If your Serbian contractor does the work entirely from Belgrade, Novi Sad, or Nis, the income is Serbian source income from the US perspective.

Services performed outside the US by a nonresident alien are foreign source income and are not subject to US withholding or Form 1042-S reporting. This rule does not depend on a treaty, so it holds for Serbia just as it does for treaty countries.

For a typical pure services engagement where the Serbian contractor never sets foot in the US, the result is: no withholding, no Form 1042-S, no 1099-NEC. There is no treaty in the background, but for pure foreign-performed services there does not need to be.

The place where the no-treaty position bites is onsite US days. If the contractor visits the US for an onsite sprint, the days physically worked inside the US are US source days. Those days may trigger withholding and a 1042-S, and with no treaty there is no reduced rate to claim on that portion. Keep a simple onsite-days log and budget for the full statutory withholding on any US-day services.

Step 3. The treaty position: there is no treaty, and that is the answer

Be direct with your finance team on this point. As of 2026, the United States and Serbia do not have an income tax treaty in force. Serbia does not appear on the IRS list of income tax treaties A to Z, and there is no surviving former-Yugoslavia income tax treaty with the US that applies to Serbia. Serbia maintains an extensive network of double-tax treaties with other countries, but the United States is not among them.

What this means in practice:

• There is no Form 8233 treaty claim to file and no treaty article to cite, because there is no treaty.
• There is no treaty-reduced US withholding rate to fall back on for any US source income, so US-day services face full statutory withholding.
• For pure services performed in Serbia, none of this matters, because foreign-source services are not subject to US withholding regardless of treaty status.

This is different from how you would handle a contractor in a treaty country. With Poland or Portugal the treaty sits in the background for edge cases. With Serbia there is no background to fall back on, so the discipline is to keep all work performed in Serbia and document it. For the contrast, see our Form 8233 treaty exemption guide, which covers what you would do if a treaty existed.

Serbia side: what your contractor handles

You as the US payer are not in scope for Serbian taxes. The Serbian contractor is. Understanding the landscape helps you have an informed conversation about invoice format, PDV, and the contractor’s setup.

Preduzetnik, the pausalac regime, the PIB, and the Poreska uprava

Most Serbian freelancers working with international clients register as a preduzetnik (entrepreneur, the sole-trader status). Many elect the pausalac (lump-sum) regime, in which the Poreska uprava (Serbian Tax Administration) sets a fixed monthly tax and social-contribution amount based on activity and location, rather than taxing actual income and expenses. The pausalac regime is available below an annual turnover threshold, generally up to RSD 6 million, with certain activities excluded. The contractor receives a PIB (Poreski Identifikacioni Broj, the tax identification number).

A separate set of rules applies to individuals who earn freelance income without registering as a preduzetnik, which Serbia taxes under specific freelancer rules. Either way, the regime selection is the contractor’s decision and their accountant’s job. You as the US payer do not need to know which regime they use. You only need a valid invoice.

PDV (VAT) and the registration threshold

Serbia’s standard PDV (Porez na dodatu vrednost, VAT) rate is 20 percent, with a reduced 10 percent rate on certain goods, administered by the Poreska uprava. Many small preduzetnik freelancers are below the Serbian VAT registration threshold and are not in the PDV system at all, so they issue invoices without PDV.

Where a contractor is PDV-registered, services supplied to a foreign recipient are generally outside the scope of Serbian PDV under the place-of-supply rules. Either way, you as the US payer do not pay or recover Serbian PDV on the invoice.

Social contributions

A preduzetnik pays Serbian social contributions on their own income, bundled into the pausalac assessment for lump-sum taxpayers. These are the contractor’s own obligation. You as the US client do not pay or contribute to Serbian social security and have no Serbian reporting obligation.

The payment rail decision

There are four real options for paying a Serbian contractor from a US bank account. The picture improved in 2025 because Serbia joined SEPA.

Serbia is not in the EU and the local currency is the Serbian dinar (RSD), but Serbia joined SEPA in 2025, so EUR-denominated transfers now reach Serbian bank accounts faster and more cheaply than before. Many Serbian freelancers hold a EUR or USD account specifically to receive foreign payments cleanly. For USD invoices, Wise or Payoneer is typically the cleanest. A SWIFT wire still works to any Serbian bank and is a fine fallback for one-off larger payments, though it loses the most to FX margin. For a deeper comparison, see our guide on FX margin in international contractor payments.

Misclassification risk in Serbia

Serbia has a specific, well-known reclassification mechanism that US buyers must understand: the independence test for entrepreneurs, in force since 1 March 2020. The test, set out in Serbia’s personal income tax law and administered by the Poreska uprava, examines nine criteria that look at whether a preduzetnik is genuinely independent or is effectively a disguised employee of a single principal.

The nine criteria cover factors such as: the principal setting working hours or leave, the principal providing training and supervision, the principal providing the workspace, the principal providing tools and equipment, restrictions on working for other clients, income heavily concentrated with one principal, and a long duration of engagement with one principal (more than 130 days in a 12-month period). If a contractor meets five or more of the nine criteria in relation to one principal, they fail the test and the income can be reclassified and taxed at a higher effective rate.

For a US company, the practical exposure is that an arrangement which looks like full-time employment, one client, fixed hours, your equipment, no other clients, will push a Serbian contractor into failing the independence test, with tax consequences that strain the relationship and can prompt the contractor to push costs back to you.

The mitigations are the same as in other markets, and they map directly onto the nine criteria: a properly drafted services agreement that establishes the contractor relationship in substance, a scope tied to deliverables not time, evidence the contractor has other clients, the contractor using their own equipment, and a documented review at six and twelve months. For more depth, see our guide on drafting an SOW for global contractors. Worker classification is the same core risk US companies manage at home, covered in our worker misclassification entry. The Omnivoo Contract Management SOW templates bake these protections in by default, including clear IP assignment and a governing law clause, and they avoid the independence-test triggers in how the relationship is described.

End-to-end workflow

Here is the clean version for a US company onboarding its first Serbian contractor.

1. Send the contractor a B2B services agreement that defines deliverables, payment, IP assignment, and termination, anchored by a master service agreement and a statement of work.
2. Collect a signed W-8BEN before any payment moves. Leave Part II blank, because there is no treaty to claim.
3. Confirm the contractor is registered as a preduzetnik with a PIB and can issue a valid invoice, and check whether they are PDV-registered (most small freelancers are not).
4. Pick a payment rail (Wise, Payoneer, or EUR via SEPA) and onboard the contractor’s payout details (Serbian IBAN, or a EUR or USD account if they hold one).
5. Pay the invoice on schedule. Keep the W-8BEN, services agreement, invoice, and payment receipt together as a packet.
6. Review the engagement quarterly against the nine-criteria independence test and refresh the W-8BEN every three years.

If you are also comparing rails across countries, our global contractor payment methods compared 2026 guide covers the broader options, and our guide to paying international contractors from the US in 2026 walks the general framework. If you pay contractors elsewhere in Europe, see our guides on paying Poland, Romania, and Ukraine contractors.

When a platform pays for itself

A US founder paying one Serbian contractor can do this manually. A US team paying five or more Serbian contractors faces enough W-8BEN refreshes, no-treaty source-of-income checks, independence-test reviews, and FX margin questions that a platform pays for itself within a few months. The no-treaty status makes the documentation discipline more important, not less, because there is no treaty safety net if work creeps into US days.

Omnivoo Contract Management costs a flat $49 per contract. We draft the B2B services agreement with Serbia-specific IP and independence-test clauses, collect the W-8BEN, capture the invoice on every payment, run the FX payment through a SEPA or USD rail to avoid SWIFT leakage, and store the full packet for audit. Transaction fees are passed through at cost, with no FX markup and no subscription.

A simple sanity check

Three questions for every Serbian contractor relationship.

1. Is there a signed W-8BEN on file, with Part II left blank because there is no treaty, and is it less than three years old?
2. Will all the work be performed in Serbia for the foreseeable future, with US onsite days kept to zero or logged?
3. Are we paying through a rail that handles EUR via SEPA or USD cleanly and captures the invoice for every payment?

If yes to all three, you are in good shape on the US-Serbia stack despite the absence of a treaty. The remaining work is misclassification hygiene over time, watching the nine-criteria independence test.

Want to skip the assembly entirely? See how Omnivoo Contract Management handles Serbian contractors end to end, or talk to our team about your specific setup.