How to Invoice Translation Clients

Translation invoicing has quirks that generic invoicing advice doesn't cover: per-word billing, source vs. target word counts, agency payment terms that stretch to 60 days, PO numbers, multi-currency billing, and VAT rules that vary by country.

Here's a practical guide to getting it right.

What Goes on a Translation Invoice

Every translation invoice should include:

• Your name/business name, address, and tax ID (or VAT number if applicable)
• Client name and billing address
• Invoice number (sequential, unique)
• Invoice date and due date
• PO number (if the client provided one — critical for agencies)
• Project description — source language, target language, subject matter
• Word count and per-word rate (or hourly rate and hours)
• Any additional charges (rush fees, certification fees, minimum fee adjustments)
• Total amount and currency
• Payment method and bank details

Sample line items for a typical invoice

| Description | Quantity | Rate | Amount | |-------------|----------|------|--------| | EN→DE translation, technical manual | 4,850 words | $0.18/word | $873.00 | | Rush fee (24-hour delivery) | 1 | 30% surcharge | $261.90 | | Total | | | $1,134.90 |

Keep it clean. One line per deliverable, clearly labeled.

Source Word Count vs. Target Word Count

This is a perennial debate. Source word count (the original document) is the industry standard for pricing because:

• Both parties can verify it before work begins
• It's not affected by how "wordy" a language is
• It enables upfront quoting

Target word count (the translated document) matters in some markets — particularly for translations into languages that expand significantly (English → German typically expands 15–30%, English → Finnish can expand 30–40%).

If you price by source words, your per-word rate should already account for typical expansion. If a client insists on target word count pricing, adjust your rate downward proportionally — but make sure the math works out the same.

Always state on your invoice which count you're billing: "4,850 source words" or "5,720 target words." Ambiguity here leads to disputes.

Word Count Verification

Word counts should be agreed upon before you start translating. The standard approach:

1. Receive source file
2. Run word count in your CAT tool (Trados, memoQ, etc.) or Word
3. Report word count to client with your quote
4. Client approves
5. Translate
6. Invoice based on the agreed count

For CAT tool users, the weighted word count (accounting for TM matches, repetitions, and fuzzy matches) is often the billing basis for agency work. Your invoice should reference this: "Weighted word count per Trados analysis: 3,200 words."

For direct clients who don't use CAT tools, total source word count (from Microsoft Word or Google Docs) is standard.

Invoicing Agencies vs. Direct Clients

These are fundamentally different billing relationships.

Agency invoicing

• PO numbers are mandatory. Most agencies won't process an invoice without one. Always include the PO number you were given when assigned the project.
• Payment terms are longer. Net 30 is common; Net 45 and Net 60 are not unusual. Some agencies pay Net 30 from end of month (meaning a job delivered January 5th won't be paid until March 1st). Know the terms before accepting work.
• Rates are pre-negotiated. Your rate is typically agreed upon when you join the agency's vendor roster or when they assign the project. The invoice just confirms it.
• They may require specific invoice formats. Some agencies have portals or templates. Follow their system.
• Volume matters. Agencies provide steady work. A slightly lower rate that generates $2,000–$4,000/month in consistent assignments can be more valuable than sporadic direct clients at higher rates.

Direct client invoicing

• Payment terms are shorter. Net 15 or even due on receipt is appropriate. Direct clients are not processing hundreds of translator invoices — they can pay quickly.
• You set the rate. No vendor roster. Quote the project, client accepts, you deliver and invoice.
• Include more detail. Agency project managers understand "EN→DE, 4,850 words, technical." A direct client might need: "Translation of product manual from English to German, Chapters 3–5, including terminology consistency check."
• Follow up promptly. Direct clients don't have AP departments tracking invoices. If you don't follow up, invoices can slip through the cracks.

International Invoicing: Currencies and VAT

Translators work internationally more than almost any other freelance profession. This creates billing complexity.

Which currency to invoice in

Default rule: Invoice in your own currency. You earned $0.18/word — bill in USD. The client handles conversion.

Exception: If an agency contract specifies payment in their currency (EUR, GBP, etc.), invoice in that currency but track the USD equivalent for your records. Note the exchange rate you used.

Multi-currency clients: If you regularly work with clients in 3–4 currencies, pick one "home" currency for your accounting and convert everything else to it monthly. Trying to track profitability across five currencies without conversion is a headache that compounds.

VAT for translators

If you're US-based: You generally don't charge VAT to international clients. US freelancers aren't registered for VAT unless they've voluntarily registered in an EU country.

If you're EU-based:

• B2B within the EU (different country): Reverse charge applies. You invoice without VAT and note "Reverse charge — Article 196 Council Directive 2006/112/EC" on the invoice. The client accounts for VAT in their country.
• B2B outside the EU: No VAT. Note "Outside scope of EU VAT" on invoice.
• B2C (rare for translators): You may need to charge VAT based on the client's country.

If you're UK-based: Post-Brexit, B2B services to EU clients are outside the scope of UK VAT. You don't charge VAT, but you should note it on the invoice.

When in doubt, consult an accountant who understands international services. VAT mistakes are expensive to fix.

Payment Methods for International Translators

The translator's payment method challenge: your client is in Munich, you're in Chicago, and the agency paying you is in London.

• Bank wire (SWIFT): Reliable but expensive. Expect $15–$45 in fees per transfer, plus unfavorable exchange rates from intermediary banks. Best for large invoices ($1,000+).
• Wise: Significantly cheaper for international transfers. Real mid-market exchange rate plus a small transparent fee. Many translators now list Wise details on their invoices.
• PayPal: Widely accepted but expensive for the receiver (2.9% + currency conversion markup). Agencies use it because it's easy. For a $500 invoice, you're losing $15–$20.
• Direct deposit / ACH: Free or nearly free for domestic transfers. If your agency is in the same country, insist on this.

List your preferred payment method on every invoice. If you accept multiple methods, order them by preference (your cheapest option first).

Invoice Timing and Cash Flow

Translation work is lumpy. You might deliver three projects in a week, then nothing for ten days. Combine that with Net 30–60 agency terms, and cash flow gets unpredictable.

Strategies:

• Invoice immediately upon delivery. Don't batch at month-end. The clock on Net 30 starts when the agency receives your invoice, not when you delivered the work.
• Track outstanding invoices rigorously. A spreadsheet at minimum: invoice number, client, amount, date sent, due date, date paid. When you have 15–20 invoices out with different agencies, you need to know what's overdue.
• Stagger your client mix. If 100% of your income comes from agencies paying Net 45, you'll always be six weeks behind. Direct clients paying Net 15 or on receipt help smooth cash flow.

Invoice Numbering for Translators

Keep it simple and sequential. Some formats that work well:

• INV-2026-001 — Year and sequence. Clean, sortable.
• INV-2026-03-001 — Year, month, sequence. Useful for monthly accounting.

Avoid client-specific numbering unless you have a strong reason. Agencies don't care about your invoice numbers — they track by their PO numbers. Sequential numbering across all clients is simpler to manage.

Common Mistakes

1. Forgetting the PO number on agency invoices. This delays payment by weeks.
2. Not specifying source vs. target word count. Leads to disputes.
3. Invoicing in the wrong currency. Check the contract.
4. Missing VAT notation when it's required (especially reverse charge).
5. Not following up on overdue invoices. Agencies have hundreds of vendors — squeaky wheel gets paid.
6. Inconsistent rates. If you quoted $0.14/word and invoice at $0.15/word, you'll get a correction request and lose trust.

Double-check every invoice against the original quote or PO before sending. Two minutes of review prevents weeks of back-and-forth.