A simple flat-rate income tax calculator: enter your gross income and a tax rate, and see the tax owed and your net (take-home) income. Useful for quick estimates, side-income planning and comparing flat-tax scenarios.
Most countries use progressive brackets rather than a single rate, so for a precise return use your tax authority's calculator. For marginal decisions — "what if I earn $1,000 more" — your marginal bracket rate is the right number to enter here.
Frequently asked questions
Which rate should I enter?
For a rough estimate, your effective (average) rate; for the impact of extra income, your marginal (top bracket) rate.
Does it handle social security or other deductions?
No — this is income tax only. Add those rates together if you want an all-in deduction estimate.
Can it handle negative income?
Enter 0 or more; a loss year needs a different calculation (often carry-forward rules).
中文说明
简单的单一税率所得税计算器：输入税前收入与税率，即可得到应纳税额与税后实际到手收入。适合快速估算、副业收入规划与单一税制场景比较。
多数国家采用累进税率而非单一税率，因此精确申报请以税务机关的计算工具为准。若是边际决策（"多赚 1000 元会怎样"），此处应填入你的边际税率档。
常见问题
应该填哪个税率？
粗略估算填实际（平均）税率；看额外收入的边际影响则填边际（最高档）税率。
包含社保等其他扣缴吗？
不包含，本页只算所得税。若想估算全部扣缴，可把各项税率相加后输入。
收入为负怎么办？
请输入 0 或正数；亏损年度的计算通常涉及结转规则，本页不适用。