Dual-Income Household Optimizer

Compare dual-income household savings capacity, tax drag, fees, and downside cash-flow stress.

Dual-income vs single-income household optimizer

Compare dual-income and single-income Korean household scenarios after income tax, social insurance, childcare support, extra work costs, and long-term savings.

Better scenario

Dual income

Monthly disposable gap

₩1,004,390

Dual minus single

Annual disposable gap

₩12,052,680

Dual monthly disposable

₩2,733,357

Single monthly disposable

₩1,728,967

Break-even second salary

₩18,000,000

Calls the Korean dual-income optimizer with 2026 income-tax brackets, earned-income deduction, National Pension, health insurance, long-term care, employment insurance, childcare support, and year-end tax deductions. This English finance calculator calls the same Korean pure calculation module as the Korean page. KRW and Korean statutory thresholds are preserved instead of the old generic percentage stub.

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Dual-income household optimizer guide

This English guide translates the Korean dual-income versus single-income household optimizer. The calculator calls calculateDualIncomeOptimization and keeps tax, social insurance, childcare support, work-cost, and long-term projection logic.

Tax and social insurance comparison

The Korean model calculates each spouse income tax with 2026 earned-income deduction, personal deduction, credit card deduction, medical deduction, education deduction, insurance deduction, donation deduction, standard tax credit, and child tax credit logic.

It also calculates National Pension, health insurance, long-term care, and employment insurance. The single-income case is not just spouse 2 salary set to zero; it changes spouse deduction, household income, childcare support, extra work costs, and disposable cash flow.

Childcare and extra dual-income costs

Dual-income households often gain salary but also add childcare, housekeeper, commute, dining, and work-related costs. The Korean engine keeps monthly childcare, housekeeper, extra transport, and work-related cost inputs so the comparison is not biased toward dual income.

Childcare support includes parental leave pay, child allowance, childcare subsidy, and income-tier care support assumptions. The model also uses the 2026 4-person median income table for support-rate logic.

Decision output

The result reports dual and single net disposable monthly cash flow, annual gap, tax gap, insurance gap, childcare support gap, break-even second salary, 10-year projection, and recommendation list.

A positive monthly gap supports dual income financially, but a small gap may not justify family-time tradeoffs or stress. The English page keeps the Korean recommendation categories so tax, insurance, childcare, expense, and general advice are all considered.