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Never Use Floats for Money: Decimal, Integer Cents and Rounding Rules

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Business & Operations intermediate 6 min read $0.01 Updated 2026-10-19

Correct money handling in code: why binary floating point fails, integer minor units vs decimal types, currency exponents, rounding modes and where to round, allocating splits without losing cents, tax and discount order, database column types and JSON transport.

Totals are off by a cent, refunds do not match, and 0.1 + 0.2 is not 0.3. Store money as integer minor units or decimals, define rounding once, and allocate remainders without losing cents.

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#money#decimal#rounding#floating-point#payments

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