Expatax is a Utrecht-based firm serving internationals since 2000: their team prepares and files your Dutch income tax return for €300 plus 21% VAT (about €363) for a P-form, the same for an M-form, and 50% extra for a partner return (per their published price list, June 2026). Taxmo is the self-serve alternative: a guided wizard with a free refund calculation, then €59 incl. VAT one-time (Box 1) or €95 incl. VAT (Box 2/3) to file directly to the Belastingdienst, fiscal partner data included rather than billed separately.
Expatax: P-form €300 + 21% VAT (≈ €363); partner adds 50% (≈ €181 incl. VAT extra); M-form also €300 + VAT. Taxmo: the M-form for €129 incl. VAT; €59 incl. VAT one-time for a Box 1 return, €95 incl. VAT including Box 2 and Box 3, partner included. For a couple with a standard return the difference is roughly €545 versus €59.
Expatax offers human preparation, advice, and handles the Belastingdienst correspondence, plus adjacent services (payroll, 30% ruling applications). That is worth paying for in complex cross-border situations. For a resident employee with a jaaropgaaf, a home, and normal deductions, the rules are mechanical, and Taxmo applies them automatically with a full breakdown you can verify line by line.
Pick Expatax for foreign income structures, the narrow migration-year situations the M-form screening questions send to an adviser, or when you want an advisor on record. Pick Taxmo when you worked the full year in the Netherlands and want the same filing done in 15 minutes for roughly a sixth of the price, with the refund visible for free before you commit, or when you moved mid-year, with or without a fiscal partner: Taxmo files the M-form from €129 incl. VAT.