01Who has to file it
Autónomos under direct assessment, normal or simplified, carrying out an economic activity. There is one important exception: if in the previous year at least 70% of your professional income had withholding applied, you are not obliged to file. That covers many professionals who only invoice companies. If you invoice individuals, you almost certainly file it.
02The cumulative logic
Modelo 130 does not look at the quarter. It looks at the year from 1 January to the last day of the quarter. You calculate cumulative profit, apply 20% and subtract everything you have already advanced: the previous quarters' payments and the withholdings applied to you. That is why a poor third quarter can come out at zero even if the first was excellent.
03Boxes 01 to 03: income, expenses and profit
Box 01 holds computable income for the year to date. Box 02 holds deductible expenses for the same period, including the autónomo quota and, under the simplified method, the 5% hard-to-justify allowance. Box 03 is the difference: cumulative net profit.
04Box 04: the 20%
It is 20% of box 03. If profit is negative, box 04 is zero. There is no negative payment: a loss-making quarter refunds nothing, it only reduces what you accumulate.
05Boxes 05 and 06: what you already advanced
Box 05 holds the instalments paid in previous quarters of the same year, net of reductions. Box 06 holds the withholdings and payments on account your clients applied over the year to date. Both are subtracted from box 04.
06Box 07 and box 13: result and reduction
Box 07 is 04 minus 05 minus 06. If positive, that is what you owe before deductions. Box 13 is the article 110.3.c reduction: if the previous year's net profit was 12,000 € or less, you can subtract up to 100 € per quarter, in bands that fall as that profit rises. It is based on the previous year, not the current one.
07Box 16: main residence
If you are entitled to the deduction for investment in your main residence (purchased before 2013) and your profit does not exceed a certain limit, you can subtract 2% of profit capped at 660.14 € per quarter. Very few people can use this box today, but it exists.
08Negative results and how they carry forward
If a quarter's result is negative, you pay nothing and the amount stays available to deduct in the following quarters of the same year. It goes in box 15. If you do not carry it forward, you overpay and recover it on the annual return, a year later.
09How Fider calculates it
Fider adds income and deductible expenses from the freelance wallet since January, applies 20%, subtracts previous payments and withholdings, and computes the reduction using the previous year's profit you provide. The result is a draft to review with your advisor. Fider does not file the form.