Jonas is German, lives in Alicante and is about to start as a self-employed translator. Filling in Modelo 036 on the online office, he got to the end and wrote to us puzzled: he could not find where to enter the NRC or how to set up a direct debit. The answer surprised him: Modelo 036 is not paid. It is a census declaration with no tax, free and with no fee. But the decisions taken in those boxes fix what he is going to pay from that day on, when, and with what room to defer it. This page is about that: how the things Modelo 036 sets in motion are paid.
What a box in Modelo 036 switches on
The General Regulation on Tax Management and Inspection, in its article 9, lists what is communicated on registration: the activity and its heading, the VAT regime, whether or not the simplified income tax (IRPF) regimes are waived, whether intra-community transactions will be carried out, whether workers are hired or premises are rented, and whether purchases start before sales. Each of those answers creates a periodic obligation with its own payment calendar. The general explanation is on the page on registering as self-employed with the tax agency.
The payments that arise from registration, and whether they can be deferred
| Return or contribution | What switches it on in Modelo 036 | How it is paid | Can it be deferred? |
|---|---|---|---|
| Modelo 303, quarterly VAT | General VAT regime | NRC, direct debit or charge to an account on filing | No, unless you show that you have not been paid the VAT you charged |
| Modelo 130, income tax instalment | Direct assessment of net income, if less than 70 % of your income carries withholding | The same routes | Yes |
| Modelo 111, withholding on workers or professionals | Hiring, or paying invoices with withholding | The same routes | No: it is money withheld from someone else |
| Modelo 115, withholding on the rent of premises | Renting premises for the activity | The same routes | No |
| Self-employed contribution | Modelo 036 does not switch it on: it goes through Social Security | Monthly direct debit | Under Social Security's own rules |
The exclusions in the fourth column come from article 65.2 of the Ley General Tributaria, Spain's General Tax Act: the withholder's debts cannot be deferred, nor, except with proof of non-payment, those for taxes that are passed on to the customer, such as VAT. It is explained in the debts that cannot be deferred.
One of Jonas's quarters, in euros
- Invoicing for the quarter: €12,000 to private individuals, who do not withhold. Output VAT at 21 %: €2,520.
- Deductible input VAT on a computer and software: €400.
- Modelo 303: 2,520 − 400 = €2,120 payable.
- Deductible expenses for the quarter: €3,000. Net income: €9,000.
- Modelo 130: 20 % of 9,000 = €1,800, with no withholdings to subtract.
- Total to Hacienda for the quarter: €3,920, payable between the 1st and the 20th of the month after the quarter.
- Deferrable part of that €3,920: only the €1,800 of Modelo 130. The €2,120 of VAT is not, unless he proves he has not been paid.
Setting aside every month, in a separate account, the VAT and income tax share of what is invoiced is what stops the 20th from arriving with no money for the return that cannot be deferred.
NRC, direct debit and account charge, on the returns that are paid
The NRC is the code your bank generates when it collects the amount and which proves the payment; with it you file on the online office. The charge to an account on filing does the same in a single step, if your bank is a collaborating bank. Direct debit lets you file earlier and have the charge made on the last day of the period, but it closes a few days before the end; the exact date is published by the Agencia Tributaria, the Spanish tax agency, for each period. Anyone using direct debit must work to that date, not to the 20th.
If Jonas's account is with a German bank, it is worth opening one with a Spanish collaborating bank before the first quarter: payments of self-assessed returns go through them.
The box that can bring a refund forward
Almost nobody takes advantage of this. Article 9 of the regulation allows you to state on registration that purchases start before sales. If Jonas invests in equipment and training before invoicing, ticking that option lets him deduct the VAT on those purchases from the start, even though he has no income yet. A Modelo 303 with more input VAT than output VAT is carried forward to following quarters, or refunded when the last quarter of the year allows it. It is not free money, it is your money sooner, and in the first year that matters.
The income tax you may not have to pay in advance
Modelo 130 is not compulsory for everyone. If at least 70 % of the income from the professional activity in the previous year was subject to withholding, the professional does not file instalment payments. In the first year, with Spanish business clients who withhold, Modelo 130 may not exist, and the withholding on the invoices, which in the first years can be 7 % instead of 15 % if the payer is told, acts as the payment on account. The detail is in the guide on Modelo 130 for the self-employed.
Paying VAT when you are paid, not when you invoice
There is another Modelo 036 decision that changes the payment calendar and is almost always taken by default: the special cash accounting regime (criterio de caja). Under the general regime, VAT falls due on invoicing, and Jonas pays it in the Modelo 303 for the quarter even if his client pays him at ninety days. Under cash accounting, output VAT is declared when it is collected, with a time limit at the end of the following year. The trade-off is that the VAT on his purchases is not deducted until he pays for them either, and that his business clients have to apply the same rule to what they buy from him.
For a translator who charges private individuals cash on the spot, nothing changes. For someone who works with agencies that pay late, it can be the difference between advancing the VAT of a slow-paying client or not. The option is exercised with the census declaration, on registering or within the periods the rules set for later years, and it is best decided with the figures for the expected invoicing in front of you.
If the 20th arrives and there is no money
The practical rule is always to file. A Modelo 303 filed without payment does not generate a penalty for non-payment: the debt moves into the enforcement period, with a 5 % surcharge if it is paid before the providencia de apremio, the formal demand for payment. A Modelo 303 not filed, on the other hand, leaves the door open to a request from the tax office and a penalty. They are two routes with very different costs for the same cash problem.
There is no fee or payment for filing it. If a website charges you to "process Modelo 036" or asks for card details to complete it, it is not collecting a tax: it is charging for a service, and it is worth knowing who is behind it before handing them over. A professional can charge you for advising you and filing it, but that has to appear in a quote bearing their name.
The first date with money involved
If Jonas files Modelo 036 in October 2026, his first Modelo 303 and his first Modelo 130 will be those for the fourth quarter, with a deadline of 30 January 2027 for Modelo 303, and the annual summary on Modelo 390 also in January. The self-employed contribution starts in the month of registration with Social Security. Organising those dates is what the calendar of returns for the first year does. And if you want us to review the boxes before filing, the self-employed registration form is the way.