Best invoicing & accounting tools for EU solopreneurs (2026)

If you want invoicing, bookkeeping and an actual accountant handling your Estonian/EU filings, this is the closest thing to “done for you”. Built around e-Residency, so it fits remote founders especially well.

Where it shines. A freelance designer in Berlin billing clients in three countries doesn’t want to learn reverse-charge rules — Xolo’s flow applies them, and a human checks the books. You get a legal address, monthly bookkeeping and the OÜ admin in one subscription instead of a bookkeeper on retainer.

Pros: one login for company + invoicing + accountant; built for e-Residency; removes the “do I owe VAT here?” question. Cons: monthly cost is higher than self-serve tools; it’s oriented around an Estonian OÜ, so it fits that structure best.

Best for: service solopreneurs (consulting, design, dev) who would rather pay to never think about EU filings.

Not accounting, but the multi-currency business account most EU solos end up running. Get paid in several currencies without the bank eating the spread — local receiving details in EUR, USD and GBP mean a US client pays you like a local and you convert at the real mid-market rate.

Concrete example. Invoice a US client $2,000. Through a typical high-street bank’s 2–4% FX spread you’d quietly lose $40–80 on that single invoice; held in Wise and converted at mid-market, most of that stays yours. Across a year of cross-border invoices that gap is a meaningful slice of a solo’s income.

Pros: real mid-market FX; free to open; the account other tools plug into. Cons: it is not accounting — it won’t do your VAT, OSS or bookkeeping, and treating it as your books is a quarter-end trap.

Best for: literally any solo invoicing across currencies. It sits under whichever accounting tool you pick. More on the mechanics in getting paid across borders.

Selling digital products through Stripe or Paddle? Quaderno automates the EU VAT and OSS side so you’re not reconciling tax rates by hand at quarter’s end. It watches each sale, applies the buyer’s local rate, collects the location evidence the rules demand, and spits out an OSS-ready report.

Concrete example. You sell a €39 course. A buyer in France should be charged 20% VAT, a buyer in Germany 19%, a buyer in Hungary 27% — and you must keep two non-contradictory pieces of evidence of where each buyer was. Doing that by hand across a few hundred sales is a lost weekend; Quaderno does it at checkout.

Pros: correct rate per country automatically; OSS-ready reporting; integrates with the checkouts solos actually use. Cons: it’s a VAT/reporting layer, not a bookkeeper or an accountant — you still file (or hand off) the return.

Best for: digital-product and SaaS solos doing enough volume that manual rate-handling is a real risk.