Alimony Calculator

Written byOleh Soloninupdated 5 October 2026

Method

Income after tax

Children

Months in arrears

Result

Share of income25%
Monthly support17,500.00 ₽
Per child17,500.00 ₽
Arrears17,500.00 ₽
Left to the payer52,500.00 ₽

A quarter, a third or a half of income

Child support as a share of income under article 81 of the Family Code or as a fixed monthly sum, plus accumulated arrears.

The baseline shares under article 81 of the Family Code are a quarter of income for one child, a third for two and a half for three or more; a court may raise or lower them given the parties' circumstances. They are calculated on income after tax rather than on gross pay, which is the detail most often got wrong.

A fixed sum is ordered where income is irregular — a business owner, a freelancer, someone paid informally. Article 117 of the Family Code sets it as a multiple of the regional subsistence minimum for a child, so it rises with that figure.

How to use

Choose the basis: a share of income, or a fixed monthly sum where earnings are irregular.
Enter income after income tax — after it, not gross — and the number of children.
Enter the number of months owed if you need the accumulated arrears.
Read the monthly amount, the amount per child and what is left to the payer.

The statutory shares and what follows from them

Article 81 of the Family Code sets three shares: a quarter of income for one child, a third for two, a half for three or more. They are applied to income after tax has been withheld, which is where most calculations go wrong — the percentage is taken from gross pay instead.

The shares do not scale with the number of children. One child takes 25 percent; two take 33.3 percent between them, not 50, and split it equally. So where support is ordered for two children, each receives less than an only child would. A further child of the payer does not change an existing order by itself: the amount is revised by a court on application (article 119 of the Family Code).

Income after tax of 70,000 ₽. Worked out with this calculator under article 81 of the Russian Family Code.
Children	Share of income	Support on 70,000 ₽	Per child	Left to the payer
1	25%	17,500 ₽	17,500 ₽	52,500 ₽
2	33.3%	23,333 ₽	11,667 ₽	46,667 ₽
3	50%	35,000 ₽	11,667 ₽	35,000 ₽
4	50%	35,000 ₽	8,750 ₽	35,000 ₽

When a fixed sum replaces the share

A share works where there is a regular salary behind it. Where income is irregular, paid in foreign currency or in kind, a court fixes a monthly sum instead — set under article 117 of the Family Code as a multiple of the regional subsistence minimum for a child, so it is indexed as that figure moves. A hybrid also exists: a share of declared pay topped up by a fixed amount.

Deductions from wages are capped at 70 percent in total. That ceiling matters when several enforcement orders run at once: child support ranks first, but together with the rest it cannot cross the limit.

What this calculator shows

The monthly amount and the share it was based on
The amount per child where there is more than one
Arrears accumulated over the number of months you specify

What to keep in mind

Total deductions from pay cannot exceed 70 percent — worth checking where several enforcement orders exist.
Support is withheld from almost all income, including bonuses and holiday pay, but not from travel reimbursements or bereavement assistance.

FAQs

Which income is support withheld from?

Salary, bonuses, holiday and sick pay, pensions, rental and business income. Not from travel reimbursements, bereavement payments or maternity capital.

When is a fixed sum ordered instead?

Where income is irregular, paid in foreign currency or in kind, or not declared at all. A hybrid — a share of declared pay plus a fixed top-up — is also common.

How are arrears calculated if the payer had no job?

From the national average wage at the time of enforcement, which usually exceeds real earnings — so avoidance tends to backfire.

Is a fixed sum indexed?

Yes, automatically with the regional subsistence minimum. Payroll or the bailiff recalculates it without a fresh court order.

What is support for one child on 70,000 a month?

17,500 ₽ a month, a quarter of income after tax, leaving the payer 52,500 ₽. Two children take 23,333 ₽ between them — 11,667 ₽ each, not a quarter apiece.

Gross pay or take-home pay?

Take-home, after income tax has been withheld. On a gross salary of 80,000 ₽ that is 69,600 ₽, and the quarter is calculated from that figure rather than from the 80,000 ₽.

Do these rules apply outside Russia?

No. These shares come from the Russian Family Code. Most other jurisdictions calculate child support from tables that weigh both parents' incomes and the time the child spends with each, which produces very different figures.

Worked example

One child on 70,000 net

Input: 70,000 ₽ after tax, one child, share of income

Output: 17,500 ₽ a month, leaving the payer 52,500 ₽

Note: Two children take a third — 23,333 ₽ — not two quarters. The share does not scale in proportion to the number of children.

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