Form 143: how self-employed workers can get family tax deductions paid in advance

Amid the steady drumbeat of quarterly obligations -VAT, withholdings, instalment payments- many self-employed workers and small business owners forget that the Spanish Tax Agency also administers personal deductions that can turn into a decent monthly income. That’s the case with Form 143, the route for requesting advance payment of deductions for large families, for ascendants with two dependent children, or for having a spouse or child with a disability in your care. Although this is strictly a personal income tax (IRPF) matter and has nothing to do with corporate tax or the modules regime, it directly affects anyone working for themselves, because the core requirement for accessing it is being registered and contributing -whether under the special regime for self-employed workers or as a salaried employee.

What Form 143 is and how the advance payment works

The mechanics are simple on paper: instead of waiting until the following year’s income tax return to claim the deduction, the taxpayer can ask the Tax Agency to pay it in advance, on a monthly basis, for as long as the activity or employment that gives entitlement to it remains active. Form 143 is precisely the application that triggers that periodic payment, and it allows both an individual claim and the transfer of the right between several beneficiaries when the family situation allows it -for example, between both parents in a large family.

It’s worth being clear that requesting the advance isn’t free from an administrative standpoint: any change in the circumstances that gave rise to the deduction -deregistering from self-employment, losing large-family status, a change in the recognised degree of disability, a change of beneficiary- must be reported to the Tax Agency. Failing to do so can mean having to repay amounts collected in excess, plus interest, and can even trigger a follow-up request if the Agency spots the discrepancy when cross-checking data during the annual tax season. For a self-employed worker who stops trading or switches regime partway through the year, this is exactly the kind of detail that gets overlooked and later shows up as an unpleasant surprise.

What this means for your business

If you’re self-employed and fall into one of these categories -part of a large family, a separated or unmarried ascendant with two dependent children and no right to receive maintenance payments, or responsible for a family member with a disability-, the first practical decision is about cash flow: would a fixed monthly income suit you better, or would you rather claim the deduction in one go on your annual return? For businesses with tight cash flow, getting paid month by month can ease day-to-day pressure, even though the total amount doesn’t change depending on which option you choose.

The second decision concerns your obligation to keep the Tax Agency updated on your situation: any registration, deregistration, or change in your activity that you can foresee -a temporary suspension, a change of partners in a joint venture, a shift in family dependants- should trigger a review of your active application, not be left to run on autopilot. And if you have staff on payroll, remember that this deduction is personal to each employee, not to the company: your role as employer is limited, at most, to letting them know this option exists -never to filing it on their behalf, unless you also handle their personal tax affairs.

One more piece of the tax map worth keeping an eye on

Deductions like this one sit alongside the rest of the changes the Tax Agency is rolling out in 2026 around deadlines, forms, and social security contributions, and managing them properly demands the same rigour as any other tax obligation: check the requirements before applying, document every change in circumstances, and never assume anything when it comes to the cross-checks the Agency runs between business activity, social security contributions, and family tax filings.

At Zythos Business we support self-employed workers and small businesses precisely in this space where tax, employment, and personal matters intersect: we review which deductions and allowances you’re entitled to, keep your registration and activity details up to date, and make sure that any change in your situation -family or professional- gets reported to the Tax Agency when it needs to be. That way you avoid both losing money you’re entitled to and facing an avoidable correction down the line.