Questions to Ask Before You Hire a Financial or Tax Advisor in the Netherlands

Most financial and tax advice in the Netherlands is written for people who only have to think about one country. Yours isn't. A good Dutch advisor can be excellent at Box 3, the 30%-ruling, and pension basics and still have no idea how any of that interacts with your home country's tax treaty, FBAR filings, or a pension you're still vested in abroad — and "recommended by a friend" doesn't tell you which kind you're getting until you're already a client.

Want these seven questions on one page to bring to a call? Download the checklist (PDF).

Credentials: what to actually verify

RB or FB registration for tax advisors. Register Belastingadviseur (RB) and the Federatie Belastingadviseurs (FB) are the two main professional bodies that vet Dutch tax advisors — both maintain public member registries you can check before a first call. An advisor who can't point you to one or the other isn't necessarily bad, but you're taking their word for it instead of a professional body's.
AFM registration only matters for specific advice. The Autoriteit Financiële Markten regulates investment advice and financial products, not general tax-return help — don't expect (or demand) an AFM number from someone who's purely doing your tax filing, but do expect one from anyone recommending specific investment products or managing money on your behalf.
"We handle expats" is a claim, not a credential. Ask what fraction of their client base is actually international, and ask for a recent example — not a name, just "a client in a similar situation to mine" — close enough to yours that you can tell if they're describing your actual problem or a generic one.

The cross-border question generic advisors miss

This is the part a Netherlands-only advisor structurally cannot help with, no matter how good they are at Dutch tax law on its own:

Does the Netherlands have a tax treaty with your home country, and does this advisor know its specifics — not just that treaties exist, but which income categories it actually covers for someone in your situation.
If you're American: do they understand FBAR and PFIC, or will they tell you that's "not their department"? A Dutch-only advisor who doesn't flag PFIC exposure on a Dutch investment account can cost a US citizen far more in US tax and penalties than anything they save on the Dutch side.
If you're on the 30%-ruling: have they actually filed for someone using it, including the 2025 partial-non-resident abolition — not just heard of the ruling in passing.
If you have a pension still vested abroad: do they know how it interacts with Dutch pension rules and Box 3, or is that a separate advisor's problem they'll hand you off for?

An advisor who says "let me find out and get back to you" on one of these is being honest. One who answers confidently but vaguely is the actual red flag.

Fee structure: what's normal, what's worth a second look

Hourly or fixed-fee is standard for tax filing and easy to compare between advisors — ask for it in writing before you engage, not a verbal estimate that turns out to be a floor.
A percentage of assets under management is normal for ongoing investment advice, less normal for a one-off tax filing. If someone doing your tax return also wants a percentage of your portfolio, ask exactly what ongoing service that percentage buys you — ongoing management is a real service, but the fee should map to real, recurring work, not just access to your account balance.
Get the full fee structure in writing before the engagement starts, including what happens if your situation is more complex than a standard filing (a second property abroad, a foreign business, a mid-year move) — complexity surcharges are normal, but should never be a surprise on the invoice.

The actual questions to ask

Bring these to a first call, in this order:

Are you RB- or FB-registered, and can I look that up myself?
What percentage of your clients are international, and can you describe a recent case similar to mine?
Do you know the tax treaty terms between the Netherlands and [your home country] for [your specific income type]?
If applicable: have you filed for someone on the 30%-ruling, including its 2025 changes?
If applicable: do you understand FBAR/PFIC, or will you coordinate with a US-side advisor?
What's your fee for a filing like mine, in writing, including what would make it more expensive?
What happens if the Belastingdienst has follow-up questions after filing — is that included, or billed separately?

If an advisor answers all seven clearly and specifically, that's the strongest signal you'll get before actually working with them.

This isn't a one-time decision

Your situation changes — a mortgage, a change in the 30%-ruling's remaining duration, a growing Box 3 position, a move back home eventually — and an advisor who was right for your first tax return isn't automatically right five years in. Revisit whether your advisor still fits at the same pace you revisit your own annual financial check-in: not because something went wrong, but because "good enough when I arrived" and "good enough now" aren't always the same advisor. This is also the right moment for the annual FI recheck.