Simple vs Double Bookkeeping Tax Calculator

Simple vs Double Bookkeeping Tax Calculator helps model Korea-related business income, expenses, tax rate, and credits in English.

Simple vs double-entry bookkeeping inputs

Best method

복식부기

Best tax ₩7,629,600.

Savings vs worst

₩2,264,064

Highest scenario ₩9,893,664.

Double-entry net value

-₩672,000

Fee is not recovered in this model.

Double-entry tax

₩7,629,600

Bookkeeping credit ₩0.

Compares Korean simple expense-rate filing, standard expense-rate filing, simple ledger, and double-entry bookkeeping with bookkeeping credit, no-book penalties, local tax, and tax-accountant fee impact. This English calculator calls the same pure tax calculation function used by the Korean page. Inputs and labels are translated; the formula is not replaced by a generic value-times-rate stub.

Related calculators

Simple vs double-entry bookkeeping tax calculator

This English page translates the Korean bookkeeping comparison guide and runs all four methods: simple expense-rate estimate, standard expense-rate estimate, simple ledger, and double-entry books.

Obligation and estimate method

Korean filing duties depend on business group, professional status, new-business status, and previous-year revenue. The calculator keeps the group A, B, and C thresholds instead of assuming all sole proprietors can use the same method.

The estimate method also changes by revenue. The model applies the simple expense rate or standard expense rate where allowed, and then separately marks methods that are not eligible.

Credits and penalties

Double-entry bookkeeping can create a 20 percent bookkeeping tax credit, capped at KRW 1 million. The Korean comparison also preserves no-book penalties, including the 20 percent penalty and the 0.07 percent revenue-based penalty for double-entry obligated taxpayers.

Because local income tax is 10 percent of income tax, the method with the lowest national income tax is usually but not always the best after credits, penalties, and accountant fees are considered.

Net value of bookkeeping

The calculator shows the best method tax, the highest tax, savings versus the worst method, simple-ledger versus double-entry saving, and net saving after tax-accountant fee.

Use this before deciding whether to pay for double-entry books. For low revenue or low actual expenses, the bookkeeping credit may not recover the fee; for higher revenue or professional occupations, actual bookkeeping can materially reduce tax and penalty risk.