How to calculate Alimony Child Support in Brazil

Quick takeaways

Run this scenario in DocketMath using the Alimony Child Support calculator.

• In Brazil, “alimony” can refer to different legal duties—most commonly pensão alimentícia (support payments). The calculation approach depends on whether the payment is for a child (alimentos devidos aos filhos) or for a spouse/partner.
• DocketMath’s alimony-child-support (BR) flow is designed to help you compute amount ranges and scenarios using jurisdiction-aware inputs (e.g., dependents, income figures, and agreed/ordered structure).
• Brazilian courts typically look at a need vs. ability balancing approach—generally not a single nationwide “percentage formula.”
• Your results can change materially when you update:

  • income type (gross vs. net),
  • number of dependents,
  • custody/guard and shared-cost assumptions,
  • extraordinary expenses (school, healthcare).
• Treat DocketMath output as decision support for planning, not a substitute for a court order or lawyer-guided case strategy.

Inputs you need

Before you use DocketMath (BR), gather the inputs that the alimony-child-support calculator expects. If you don’t have every number, enter best estimates and then run multiple scenarios so you can see how sensitive the output is to each assumption.

Core fields (Brazil / BR)

• Child/children

  • Spouse/partner

  • Both (separate calculations or combined planning)

  • Example: 1 child, 2 children, etc.

  • Monthly gross income and/or monthly net income (choose the basis you can justify)

  • Stable salary vs. variable income (bonuses/commissions)

  • Documentable monthly average (e.g., last 6–12 months average)

  • Mandatory deductions (if using gross)

  • Prior support obligations (if any)

  • Monthly living costs for the child/recipient

  • Housing costs attributable to the beneficiary (if relevant)

  • Healthcare, therapy, medication (monthly average)

  • School tuition

  • Tutoring

  • Dental/orthodontics

  • Uninsured medical expenses

  • Primary care with visitation

  • Shared custody / time split

  • How costs are typically handled during each period

Output controls you may want to set

• “Conservative” (higher support need assumptions)

  • “Baseline”

  • “Lower-cost” (if costs are already covered by other arrangements)

  • If your case uses periodic adjustments, select the approach you’re modeling in the calculator.

  • (DocketMath can help model it; your final amount depends on the order and evidence.)

Primary CTA

Use DocketMath’s calculator here:

• /tools/alimony-child-support

How the calculation works

DocketMath’s alimony-child-support (BR) approach is built around how Brazilian support determinations are made in practice: a need/ability balancing test implemented through structured inputs and scenario outputs.

DocketMath applies the Brazil rule set to the inputs, then runs the calculation in ordered steps. It validates the trigger date, applies rate or cap logic, and produces a breakdown you can audit. If you change any one variable, the tool recalculates the downstream outputs immediately.

1) Convert income into “ability to pay”

DocketMath starts by converting the payor’s income into an available-payment capacity.

Practical modeling choices you control include:

• If you provide net income, DocketMath treats it as a “ready-to-pay” baseline (minus any optional listed obligations you enter).
• If you provide gross income, DocketMath uses your selection to estimate what can realistically be committed to support, based on the assumptions you set for deductions and obligations.

Because support is not strictly a fixed percentage, DocketMath does not assume a single “Brazilian alimony %” for everyone. Instead, it estimates capacity from your inputs, then balances that capacity against the beneficiary’s needs.

2) Estimate the beneficiary’s “need”

Next, the calculator constructs a monthly needs profile, typically including:

• baseline living expenses (or a modeled share of them),
• recurring healthcare and related costs,
• plus any extraordinary costs converted into monthly averages (tuition/medical).

If you toggle custody/time-sharing assumptions, DocketMath can allocate costs differently between households, changing the “need” component.

3) Balance “need” and “ability” via scenarios

Brazilian support determinations generally revolve around:

• Need (what the beneficiary requires to live according to circumstances and evidence)
• Ability (what the payor can pay without compromising subsistence and other obligations)

DocketMath operationalizes this balancing through scenario outputs—so the same income can produce different results depending on:

• number of dependents,
• detailed monthly costs,
• and whether you model shared custody costs.

4) Output results you can compare

DocketMath then returns planning numbers such as:

• estimated support amount per month (range or baseline, depending on your entries),
• how changes to custody/expense assumptions affect the result,
• sensitivity—how much the result shifts if your income average changes.

The “knobs” that typically move the number most

Use these inputs in /tools/alimony-child-support to see outcomes change:

Common pitfalls

Brazilian support computations aren’t just math—they’re heavily evidence-driven. DocketMath helps you plan with structured assumptions, but these common issues can distort scenario results:

1. Mixing gross and net figures

   • Entering gross income while using net-based assumptions can inflate capacity or mismatch what “available” funds means in your model.
   • In DocketMath, pick one basis consistently for the scenario.

2. Confusing recurring vs. one-time expenses

   • Costs like orthodontics are sometimes monthly averaged; one-time purchases should be modeled as one-time if the calculator supports that structure.
   • Over-annualizing or monthlyizing a one-time item can overstate need.

3. Underestimating healthcare and related costs

   • Healthcare and medication often play a meaningful role in support determinations.
   • Leaving out recurring medical items (medication, therapy, checkups) can produce an unrealistically low baseline.

4. Modeling custody costs incorrectly

   • With shared custody or time-sharing, you need to reflect who pays which costs during each period.
   • Use custody/time-sharing settings rather than rolling everything into “needs” without a structure.

5. Expecting a single universal percentage

   • Many people expect a rigid “percentage of income” approach.
   • In Brazil, support is typically tied to a case-specific need/ability balance and evidence.
   • DocketMath provides scenario modeling—not a guarantee of a court-ordered figure.

Sources and references

The references below are commonly cited for understanding support obligations in Brazil. This section is for context; DocketMath’s logic is oriented around scenario planning from the inputs you provide.

• Código Civil (Brazilian Civil Code), Law No. 10.406/2002

  • Articles 1.694–1.710 (support obligations; need and ability as guiding factors)
  • Includes principles related to proportionality and revision.

• Estatuto da Criança e do Adolescente (ECA), Law No. 8.069/1990

  • Child support is treated with protective priority consistent with the statute’s framework.

• Código de Processo Civil (CPC), Law No. 13.105/2015

  • Procedural rules affecting how support can be claimed, adjusted, and enforced (including provisional support dynamics).

Next steps

1. Run 2–3 scenarios in DocketMath

   • Baseline: use your best-estimate income average and recurring costs.
   • Conservative: increase needs (healthcare/education) slightly.
   • Lower-cost: adjust custody cost allocation and remove clearly non-recurring items.

2. Lock your income basis

   • If income varies, prefer an average (e.g., last 6–12 months) rather than a single month.

3. Document the inputs you used

   • Gather pay stubs, tax summaries, and monthly expense evidence you can reference when updating entries.

4. Turn the outputs into a comparison worksheet

   • Compare how changes to one input (e.g., tuition or time-sharing) shift totals.
   • This helps you identify what to verify with evidence later.

5. Use the tool

   • /tools/alimony-child-support

Related reading

• Alimony & Child Support Estimator Guide for Alabama
• Alimony & Child Support Estimator Guide for Arizona
• Alimony & Child Support Estimator Guide for Colorado