Tools & Resources for Small Businesses
UseFeeKit provides free mathematical calculators, downloadable invoicing utilities, and educational financial guides designed specifically for:
1. Essential Business Tools
Core mathematical engines for pricing, operational volume, and investment efficiency.
Calculate gross margin percentage, net margin, and markup multipliers to prevent selling services at a loss.
Determine the exact monthly unit volume and billable contract revenue required to cover fixed operating overhead.
Evaluate capital expenditures, marketing campaign yields, and business software equipment ROI.
2. Invoicing Tools & Client Billing Resources
Professional client billing utilities and educational guides on payment terms.
Create clean, professional PDF invoices directly in your web browser. Includes customizable sales tax and VAT rate fields, line-item discounts, payment term clauses, and zero watermarks or account signups.
3. Freelancing & Independent Contractor Hub
Tools to calculate billable hourly rates, factor in 15.3% SECA taxes, and plan take-home pay.
Derive minimum hourly and day rates across 27 tech and creative professions factoring in SECA and overhead.
Estimate quarterly tax voucher liabilities to avoid IRS underpayment penalties at year-end.
How to transition from a corporate W-2 salary to an independent 1099 hourly rate without losing money.
4. Payment Processing & Gateway Fees
Bidirectional calculators to pass processing cuts to clients or protect gross margins.
5. Taxes & Sales Tax Compliance
50-state sales tax nexus calculators, UK HMRC VAT compliance, and contractor tax models.
Base state statutory rates, municipal district surtax caps, and economic nexus threshold monitoring.
20% standard and 5% reduced rate calculations for Making Tax Digital compliance and B2B invoices.
Calculate deemed employment deductions versus limited company dividend distributions.
6. Profit & Margins for Service Businesses
Understand unit economics, billable margins, and commercial pricing models.
Live Profit Margin Model
Test your revenue numbers below. Calculates gross profit, profit margin %, and markup multiplier:
7. Business Finance Guides
Practical, actionable guides to bookkeeping, cash flow, and tax deductions.
A beginner's manual on chart of accounts, single vs double entry, and month-end reconciliation.
IRS Schedule C deductions, receipt preservation, mileage logs, and home office write-offs.
The $80,000 net profit threshold where electing S-Corporation tax status saves real money.
8. Accounting & Software Resources
Independent, factual evaluations of business bookkeeping and invoicing software.
When spreadsheets work well, when they expose you to tax audit risk, and the exact volume threshold when dedicated software pays for itself.
Read software comparison →A neutral breakdown of FreshBooks workflows, client billing features, evaluation questions, and alternative accounting tools.
Read FreshBooks guide →9. Frequently Asked Questions
Answers to common questions about small business finance, fee calculations, and operational tools.
What free financial tools does FeeKit provide for small businesses?
FeeKit provides 199+ dedicated, free financial calculators across payment processing fee modeling (Stripe, PayPal, Square, Wise), US state sales tax, UK VAT, freelance hourly and day rates, landed cost e-commerce profit margins, and a client-side PDF invoice generator.
How does FeeKit protect sensitive business financial data?
All calculations on FeeKit execute 100% client-side directly in your browser. FeeKit does not collect, transmit, or store your private client details, invoicing figures, or financial balances on external servers.
What is a healthy profit margin for a service-based small business?
Healthy service businesses typically target a gross margin between 50% and 70% and a net profit margin between 15% and 30%, depending on employee headcount, billable utilization rates, and overhead costs.
When should a growing small business switch from spreadsheets to accounting software?
Businesses should typically transition when they issue more than 5 to 10 invoices per month, hire staff or subcontractors, carry inventory, or spend more than 4 hours each month manually reconciling bank transactions.