GIA Professional · One Calculation Workspace
GIA Calculator Suite
One place for indirect tax, quarterly estimates, self-employed deductions, payroll tax, and everyday accounting calculations—with bookkeeping context instead of numbers alone.
2026 reference dataTax + PayrollBookkeeping ViewJournal Entry Support
Indirect Tax
Global Tax Calculator
Standard-rate sales tax, GST/HST/PST and VAT estimates. U.S. local rates remain an explicit input because exact tax can vary by address.
Net / Taxable$0.00
Tax$0.00
Gross / Invoice Total$0.00
Tax detail
Jurisdiction—
Applied rate—
CurrencyUSD
TransactionGoods
Bookkeeping view
Debit A/R or Cash0.00
Credit Revenue0.00
Credit Tax Payable0.00
U.S. Federal
Quarterly Estimated Tax Planner
2026 safe-harbor planning for individuals. It compares 90% of projected current-year tax with the applicable prior-year safe-harbor amount.
Required Annual Prepayment$0.00
Remaining Required Amount$0.00
Equal Amount Per Remaining Installment$0.00
Safe-harbor comparison
90% of projected 2026 tax—
Prior-year safe harbor—
Rule used—
2026 general due dates
Apr 15, 2026Jun 15, 2026Sep 15, 2026Jan 15, 2027
Calendar-year individual schedule. Special rules can apply.
Planning aid only; this does not calculate an underpayment penalty or annualized-income installment method.
U.S. Federal
Self-Employed Tax & Deduction Organizer
Organize verified business deductions and estimate 2026 self-employment tax. Enter only expenses you have already determined are deductible for the taxpayer's facts.
Verified business deductions
Total Verified Deductions$0.00
Net Business Profit$0.00
Estimated SE Tax$0.00
SE tax breakdown
Net earnings subject to SE calculation—
Social Security portion—
Medicare portion—
Additional Medicare Tax—
Income-tax adjustment
Employer-equivalent SE tax deduction—
2026 Social Security wage base$184,500
SE net earnings factor92.35%
This organizer does not decide whether an expense is deductible. Meals, home office, vehicle, travel, health insurance, retirement, QBI, depreciation and other deductions can have separate limitations or eligibility rules.
U.S. Payroll
Payroll Tax Calculator
2026 employee and employer Social Security and Medicare calculation. YTD wage fields track annual thresholds; current-period taxable wages drive the current payroll tax.
Used for net pay and the payroll journal entry.
Leave blank if Social Security taxable wages equal gross pay.
Leave blank if Medicare taxable wages equal gross pay.
Threshold tracker only. It changes current SS tax only when cumulative wages approach the $184,500 wage base.
Threshold tracker for Additional Medicare withholding above $200,000.
Manual in this version because Form W-4 facts affect federal withholding.
YTD wage fields are used for annual limits; small changes far below the thresholds will not change the current FICA result.
Employee FICA + Add'l Medicare$0.00
Estimated Net Pay$0.00
Employer FICA$0.00
Employee taxes
Social Security · 6.2%—
Medicare · 1.45%—
Additional Medicare · 0.9%—
Manual federal withholding—
Employer taxes
Social Security · 6.2%—
Medicare · 1.45%—
2026 SS wage base$184,500
Additional Medicare threshold$200,000
Illustrative payroll entry
| Account | Debit | Credit |
|---|---|---|
| Wages Expense | 0.00 | — |
| Employer Payroll Tax Expense | 0.00 | — |
| Payroll Tax / Withholding Payables | — | 0.00 |
| Cash / Net Payroll Payable | — | 0.00 |
Federal income-tax withholding is entered manually in this version. FUTA, SUTA, local payroll taxes, benefits, pre-tax deduction rules and special wage rules are not included yet.
Accounting Utilities
Everyday Accounting Calculators
Fast calculations for bookkeeping decisions, allocations, close work, inventory, payroll accruals, and operating KPIs.
Result0
Percentage Amount0
Gross Profit0
Margin0%
Markup0%
Annual Depreciation0
Accumulated0
Book Value0
Typical entryDr Depreciation Expense · Cr Accumulated Depreciation
Interest Portion0
Principal Portion0
Ending Loan Balance0
Journal entryDr Interest Expense · Dr Loan Payable · Cr Cash
Contribution Margin / Unit0
Break-Even Units0
Break-Even Sales0
Selling price must be greater than variable cost to produce a positive contribution margin.
Net Purchases0
Goods Available for Sale0
Cost of Goods Sold0
Per Period0
Expense Recognized0
Remaining Prepaid0
Journal entry—
Accrued Wages0
Employer Burden Accrual0
Total Payroll Accrual0
Typical entryDr Wage Expense / Employer Payroll Tax Expense · Cr Accrued Payroll / Payroll Tax Payable
Days Sales Outstanding0 days
Average Daily Credit Sales0
A/R Turnover for Period0×
DSO is most useful when the sales period and receivable balance are comparable. Use average A/R instead of ending A/R when that better represents the period.
2026 reference sources: IRS Publication 15 for Social Security/Medicare payroll rates and the $184,500 Social Security wage base; IRS Publication 505 and Form 1040-ES for estimated-tax rules and due dates; IRS self-employment tax guidance for the 15.3% SE tax framework and employer-equivalent deduction; CRA indirect-tax rate tables; ATO GST guidance; EU VAT rate guidance. Always verify transaction-specific taxability and later law changes before filing.