How to prove your income as a freelancer

André wants to rent a flat. The landlord asks for “proof of income” and André freezes: he has no payslip. The same happens to anyone applying for a loan. The good news: a freelancer can prove what they earn - not with one piece of paper, but with a set of them. The bad news: whoever under-declares to save on tax finds out, too late, that they’re left with no way to prove their real income.

There’s no single paper - there’s a set

No one expects a payslip from you. What banks and landlords want to see is income and stability. These are the documents that show it:

What builds your proof of income

IRS return (Modelo 3) + assessment note

The strongest proof: it shows the annual income you declared and the tax assessed. Get both on the Portal das Finanças

the key document

Green receipts

The history of the invoices/receipts you issued (on the Portal das Finanças, under Faturas e Recibos) - shows the month-by-month flow

Quarterly Social Security declarations

Confirm the income you reported through the year (when you're required to submit them)

Activity-opening declaration

Proves how long you've had your activity open - seniority counts

Bank statements

Show the real money coming into the account (the bank sets the period requested)

And the no-debt certificate usually joins the file, to show you’re up to date with the State.

What banks and landlords look at

In your favour

A longer track record, with stable or growing income
IRS returns consistent with what you receive
A manageable debt-service ratio (the Banco de Portugal's DSTI cap drops to ~45% from August 2026)

Raises doubts

Very recent activity, no track record
Irregular or falling income
Declared income far below what moves through your account

A mortgage tends to be among the most demanding - high amounts, long terms - so banks scrutinise the evolution of your income and the stability of your activity.

The mistake that shuts doors: under-declaring

Here’s the trap. Declaring the minimum to pay less income tax looks clever - until the day you need to prove income. A low declared income means:

less borrowing capacity;
more difficulty renting;
and, while we’re at it, it can mean a smaller pension tomorrow (you contribute on less).

What you “save” in tax today can cost you the flat or the loan. Declaring everything properly isn’t just the law - it’s what lets you use your own income when you need it.

Careful: each bank and each landlord asks for its own mix of documents - check the list first. And there are no shortcuts: proof of income is built with time and correct declarations, not at the last minute. If you know you’ll apply for a loan a year from now, start treating your declarations for what they are - your financial CV.

✅ In summary

You don’t need a payslip - you need a set: IRS return (Modelo 3) + assessment note (the key proof), green receipts, quarterly Social Security declarations, the activity-opening declaration and bank statements.
Banks and landlords want stability: a track record, income consistent with reality and a comfortable debt-service ratio. A mortgage is the most demanding.
Under-declaring shuts doors - less credit, harder to rent, possibly a smaller pension. With FIZ you keep receipts and declarations organised and consistent, so your proof of income is always ready. See the plans.