Resources
Glossary of terms
Plain-language definitions of the budgeting, tax, and savings terms used across our guides and calculators. Each entry links to the guide that covers it in full depth.
Important — Please Read
These definitions are simplified for general understanding and are not personalized financial, tax, or legal advice. Read our full disclaimer.
B
- Baseline
- The conservative, predictable monthly income figure you budget fixed expenses against — typically your lowest or near-lowest month from 6–12 months of income history, not your average. See Budget System for Variable Income.
- Buffer
- A separate savings account you top up in strong months and draw from in months that fall short of your baseline — distinct from a full emergency fund, though related. See Budget System for Variable Income.
C
- Client concentration
- How much of your total income comes from a small number of clients. Higher concentration generally means more risk of a sudden, complete income stop, which is a factor in sizing an emergency fund. See Money Basics by Worker Type.
- Coverage target
- The number of months of essential expenses your emergency fund aims to cover — commonly 3 to 6 months as a general baseline, often higher for variable income. See Emergency Fund for Variable Income.
D
- Discretionary spending
- The portion of income, or of a windfall, deliberately set aside for non-essential spending after taxes, buffer, and goals are funded — ideally decided as a specific percentage in advance. See Handling a Big Payment or Windfall Month.
E
- Effective tax rate
- Your total tax divided by your total income — your average rate across all income, as opposed to your marginal rate (the rate on your next dollar earned). See Handling a Big Payment or Windfall Month.
- Emergency fund target
- The total dollar goal for your emergency savings — monthly essential expenses × coverage target, plus a variability buffer. See Emergency Fund for Variable Income or use the Emergency Fund Target Calculator.
H
- Home office deduction
- A tax deduction for the portion of your home used regularly and exclusively for business, calculated using either a simplified flat rate or an actual-expense percentage of home costs. See Common Tax Deductions for Freelancers.
I
- 1099-K / 1099-NEC
- Tax forms that report payments made to you — a 1099-K from payment platforms and marketplaces, a 1099-NEC from a client who paid you directly. Neither necessarily reflects your full taxable income after expenses. See Money Basics by Worker Type.
L
- LLC (Limited Liability Company)
- A legal business entity that generally separates personal assets from business debts and lawsuits. Taxed like a sole proprietorship by default, unless an S-corp election is made. See Sole Proprietor vs. LLC vs. S-Corp.
N
- Net self-employment profit
- Your gross self-employment income minus ordinary and necessary business expenses — the number your income tax and self-employment tax are actually calculated from, not your total revenue. See Understanding Quarterly Estimated Taxes.
O
- Ordinary and necessary
- The IRS standard for a deductible business expense — common and accepted in your field ("ordinary") and helpful and appropriate for the business ("necessary"). See Common Tax Deductions for Freelancers.
P
- Pass-through taxation
- The default tax treatment for a sole proprietorship or LLC, where business profit "passes through" to your personal tax return rather than being taxed separately at the entity level. See Sole Proprietor vs. LLC vs. S-Corp.
R
- Reasonable salary
- The wage an S-corp owner must pay themselves for work performed, subject to payroll tax, before remaining profit can be distributed without self-employment tax — a facts-and-circumstances determination, not a fixed formula. See Sole Proprietor vs. LLC vs. S-Corp.
S
- Safe harbor
- IRS thresholds — generally 100% of last year's tax (110% above a certain income level), or 90% of the current year's — that protect you from an underpayment penalty even if your quarterly estimate isn't exact. See Understanding Quarterly Estimated Taxes.
- S-corp election
- A federal tax election, layered onto an LLC or corporation, that splits owner income into a salary (subject to payroll tax) and distributions (not subject to self-employment tax). Not a separate entity type. See Sole Proprietor vs. LLC vs. S-Corp.
- Savings rate
- The percentage of your income set aside as savings, rather than spent — a useful way to evaluate a contribution amount (like a retirement contribution) relative to your income. See the Savings Rate Calculator.
- Self-employment tax
- The 15.3% tax covering Social Security and Medicare contributions that self-employed individuals pay directly, since there's no employer to split it with. Calculated on roughly 92.35% of net self-employment profit. See Understanding Quarterly Estimated Taxes.
- SEP-IRA
- A retirement account for the self-employed funded with an employer-style contribution calculated as a percentage of net self-employment compensation — the simplest of the three main self-employed retirement account types to set up. See Retirement Accounts for Freelancers.
- SIMPLE IRA
- A retirement account combining an employee deferral with a required employer match or fixed contribution — generally used by businesses with a small team, though sole proprietors can open one too. See Retirement Accounts for Freelancers.
- Solo 401(k)
- A retirement account for self-employed people with no full-time employees (other than a spouse), combining an "employee" deferral and an "employer" profit-sharing contribution — often allowing the highest total contribution at moderate income levels. See Retirement Accounts for Freelancers.
- Sole proprietorship
- The default business structure with no separate filing required — and no legal separation between you and the business, meaning business debts and lawsuits can reach personal assets. See Sole Proprietor vs. LLC vs. S-Corp.
W
- Waterfall
- A deliberate default order for routing surplus income as it arrives — for example, taxes first, then buffer, then goals, then discretionary spending — rather than deciding ad hoc each time money comes in. See Budget System for Variable Income.
- Windfall
- An unusually large or unexpected payment, large or unusual enough that spending it like ordinary income would meaningfully change your month — best allocated deliberately rather than spent by default. See Handling a Big Payment or Windfall Month.
Important Disclaimer
Variable Income provides general educational information for freelancers and self-employed individuals. Nothing on this page is personalized financial, tax, or legal advice. Read our full disclaimer.