Your payslip explained: from gross to net and the tax withheld

Between what your employer says it pays you and what lands in your account there are two deductions, and only one of them is a tax. Understanding the difference is useful for something very concrete: knowing which part of your payslip is negotiable, which part you can adjust yourself, and which part depends on nobody. Let us take them in order.

Employee Social Security contributions

• •Common contingencies: 4.70%
• •Unemployment: 1.55% (permanent contract)
• •Vocational training: 0.10%
• •Approximate total: 6.35% of gross salary

This 6.35% is essentially fixed: it does not depend on your personal circumstances and you cannot change it. And it is only your share. The employer additionally pays around 30% on top of your contribution base, which never appears on your payslip but is part of what you cost. So when negotiating a salary, your real cost to the company is considerably higher than your gross.

One nuance surprises higher earners: contributions have a maximum base. Above that ceiling the percentage stops applying to the excess, so a very high salary contributes proportionally less. The trade-off arrives at retirement, because that same maximum base also caps the future pension.

Income tax (IRPF) withholding

Income tax is calculated on the taxable base (gross salary minus contributions minus personal allowance). The withholding percentage varies by salary, autonomous community and personal circumstances. For a €30,000 salary with no special circumstances, withholding typically falls around 15–17%.

Unlike contributions, this part is yours to adjust. The document that sets it is Form 145 — the one you filled in when you joined and have probably not looked at since. On it you declare children, dependent ascendants, disability, compensatory pensions, or whether you are paying a mortgage on your main home with deduction rights. Every one of those circumstances lowers your withholding.

Example: €30,000 gross annual salary

• •Monthly gross: €2,500
• •Employee SS contributions: −€158.75/month (6.35%)
• •Estimated IRPF base: ~€28,100/year
• •Estimated IRPF withholding (~16%): −€400/month
• •Estimated net salary: ~€1,941/month

On that same gross, two people can take home very different amounts. Someone single with no children lands near that €1,941; a person with two young children may be closer to €2,050 purely through the difference in withholding. The gross is identical and so is the job: all that changes are the family allowances that reduce the base.

Extra payments

In Spain the standard is 14 payments: 12 monthly plus two bonus payments (typically in June and December). Some collective agreements include the bonus pro-rated into the 12 monthly payments, in which case the monthly net is higher but there are no separate bonus payments.

This matters when comparing job offers, because it is a classic source of confusion. «€2,000 a month» across 12 payments is €24,000 a year; «€2,000 a month» across 14 payments is €28,000. That is a 17% difference on the same advertised monthly figure. Always ask for the annual gross and the number of payments, never just the monthly amount.

Withholding is not your final tax

The withholding you see on your payslip is a payment on account of income tax, not the final liability. In the following year's tax return, the real tax is calculated from all your income, deductions and circumstances and compared with what was withheld: if too much was withheld, you get the difference back; if too little, you pay it. That is why the monthly net is an estimate and does not necessarily match your final tax.

The two-employer case

If you worked for two companies in the same year, each calculated your withholding as though it were your only income, both applying the lowest brackets. When the two salaries are added together on your return, total income falls into higher brackets and a potentially sizeable balance to pay appears. It is neither an error nor a penalty: simply, nobody withheld on the combined total. If you change jobs mid-year, it is wise to set money aside for the next return or to voluntarily request a higher withholding rate.

The income tax on your payslip, explained

IRPF (Impuesto sobre la Renta de las Personas Físicas) is one of the cornerstones of the Spanish tax system. It is a progressive tax: the same rate does not apply to your entire income — each bracket is taxed at its own rate. Understanding how it works lets you anticipate your tax return and optimise your withholding.

Regional tax-scale deflation

Several autonomous communities periodically apply deflation to their regional IRPF scale to offset inflation, which translates into a slight reduction in the tax burden and helps preserve purchasing power against rising prices. It is worth checking each year whether your region has updated its brackets.

IRPF brackets: understanding progressivity

IRPF is a progressive tax, meaning higher earners pay a higher percentage. Crucially, the highest rate only applies to the portion of income that exceeds the previous bracket — not to all income. General rates (state + average regional) in force in 2026 are:

• Bracket 1: Up to €12,450 – Rate of 19%
• Bracket 2: €12,451 to €20,200 – Rate of 24%
• Bracket 3: €20,201 to €35,200 – Rate of 30%
• Bracket 4: €35,201 to €60,000 – Rate of 37%
• Bracket 5: €60,001 to €300,000 – Rate of 45%
• Bracket 6: Over €300,000 – Rate of 47%

“Tax planning is not about paying less than the law requires — it is about not paying a single cent more than strictly necessary by using the available tools wisely.”

Deductions you cannot afford to miss

Several expenses can be deducted from your tax base. The most common include pension plan contributions (within updated limits), union fees and legal defence costs. Many autonomous communities add their own deductions for children, rent or primary residence investment.

Why do two people on the same salary have different withholding?

Withholding depends on personal circumstances: marital status, number of dependent children, disability, compensatory pensions, etc. The Form 145 you completed when you started work informs your employer of these circumstances so they can calculate the correct withholding.

What if the withholding was incorrect?

If withholding was too high, the tax authority refunds the difference in your annual tax return. If too low, you will need to pay the difference. That is why it is worth ensuring withholding is set correctly from the start by updating Form 145 whenever your personal circumstances change.