The easiest way to track income and expenses for a side hustle is to open a dedicated business checking account and connect it to a simple, automated accounting tool like Wave or Zoho Books. If you are launching a new side hustle, starting with an entity setup service like ZenBusiness simplifies your workflow by handling your LLC formation, obtaining an EIN, and setting up business bookkeeping all in one place. Sole proprietors with straightforward invoicing can rely on free software, while freelancers needing room to grow can step up to paid platforms as their volume increases.
What Is the Easiest Way to Track Income and Expenses for a Side Hustle?
The simplest method for tracking side hustle finances is to isolate your business transactions from your personal life right from day one. Commingling funds creates unnecessary work at tax time and increases the risk of missed deductions.
IRS Publication 583 states that opening a business checking account is one of the first things you should do when starting a business. The IRS instructs business owners to keep personal and business funds completely separate and use the business checkbook as the primary source for recording business expenses.
Once you establish a dedicated account, tracking becomes almost effortless. You connect the bank account to a basic accounting app, which pulls in every deposit and card swipe automatically. Instead of manually entering receipts into a spreadsheet, your primary job is reviewing auto-categorized transactions once a week.
For freelancers launching a new venture, setting up an LLC, applying for an Employer Identification Number (EIN), and choosing a bookkeeping tool can feel like an administrative hurdle. Working with an entity formation platform like ZenBusiness bridges these tasks by combining formation services, registered agent support, and ongoing expense tracking into a single workflow.
Legal and Regulatory Recordkeeping Requirements for Freelancers
Choosing a bookkeeping tool is only half the battle. You also need to know what financial records you must retain and for how long. The IRS, the U.S. Department of Labor (DOL), and state tax authorities establish strict recordkeeping guidelines for independent contractors and small business owners.
How Long Must You Keep Business Records?
Under guidance from the IRS on record retention, the standard rule requires keeping receipts, bank statements, and tax documents for at least 3 years after filing your tax return. However, specific exceptions extend this timeline:
- 3 Years: The general retention period for income tax records, supporting expense receipts, and bank deposit slips.
- 4 Years: Employment tax records must be preserved for at least 4 years after the tax becomes due or is paid, whichever is later.
- 6 Years: If you omit income that should have been reported and it exceeds 25% of the gross income shown on your tax return, the IRS has 6 years to assess tax.
- 7 Years: Records relating to a claim for a loss from worthless securities or a bad debt deduction must be kept for 7 years.
- Indefinitely: If you do not file a tax return, or if you file a fraudulent return, keep your records indefinitely.
State-level tax authorities may enforce independent timelines. For instance, California Department of Tax and Fee Administration (CDTFA) Publication 116 requires businesses to retain California sales and use tax records for at least 4 years, or longer if an active audit is underway.
What Documents Count as Proof of Expense?
IRS Publication 583 identifies several types of supporting documents needed to validate tax deductions:
- Gross Receipts: Cash register tapes, bank deposit slips, receipt books, invoices, and credit card charge slips.
- Purchases and Expenses: Canceled checks, account statements, credit card sales slips, and vendor invoices.
- Assets: Purchase and sales invoices, real estate closing statements, and canceled checks.
If you hire sub-contractors or employees, the U.S. Department of Labor (DOL) Fact Sheet #21 mandates preserving FLSA payroll records for at least 3 years. Supporting payroll documents, such as time cards, work schedules, and wage tables, must be kept for at least 2 years.
The Best Tools for Tracking Freelancer Income and Expenses (2026)
Below are the leading income and expense tracking tools for freelancers and solo operators, listed in alphabetical order.
FreshBooks
FreshBooks is designed primarily around invoicing and time tracking, making it popular among service-based freelancers, consultants, and agency workers. It offers automated payment reminders, client portals, and proposal building.
- Pricing (as of 2026-10-06): Lite costs $23 per month (5 billable clients); Plus costs $43 per month (50 billable clients); Premium costs $70 per month (unlimited clients). FreshBooks occasionally advertises promotional pricing, such as $1 per month for a introductory period, but the ongoing base rate for entry-level usage is $23 per month.
- Pros: Excellent client-facing materials, native project time tracking, and customizable invoice templates.
- Cons: Billable client limits on lower tiers force growing freelancers into higher-priced plans quickly.
QuickBooks Solopreneur
QuickBooks Solopreneur replaced the older QuickBooks Self-Employed product. It caters to one-person businesses that do not need double-entry accounting but require organized tax categories, Schedule C mileage tracking, and basic invoicing.
- Pricing (as of 2026-10-06): Ongoing pricing is $20 per month. A promotional rate of $10 per month for the first 3 months is frequently offered, but $20 per month is the ongoing rate.
- Pros: Built-in mileage tracking via a mobile app, automatic separation of business and personal expenses, and easy export to TurboTax.
- Cons: Lacks double-entry accounting capability, meaning you cannot scale up to manage inventory or complex accounts payable without upgrading to QuickBooks Online.
Wave
Wave offers free core accounting software aimed at freelancers, solo operators, and low-volume side hustlers. It covers unlimited income and expense tracking, basic financial reporting, and invoicing.
- Pricing (as of 2026-10-06): Starter plan is free ($0 per month). The Pro plan costs $19 per month or $190 per year (with an optional 3-month promotional rate of $9.50 per month). Credit card processing fees sit at 2.9% + $0.60 per transaction. Mobile receipt scanning is available as an optional add-on for $8 per month, while payroll plans start at $25 per month.
- Pros: No monthly subscription fee on the base tier, clean user interface, and zero restrictions on transaction volume or invoicing.
- Cons: Lacks automated bank feeds on the free tier in certain regions and offers limited third-party integrations compared to paid tools.
Xero
Xero provides robust, cloud-based double-entry accounting software built for business owners who want detailed financial reporting and extensive app integration possibilities.
- Pricing (as of 2026-10-06): Early plan costs $27 per month (limited to 20 invoices and quotes); Growing plan costs $59 per month; Established plan costs $97 per month. Xero often runs a promotional 80% discount for the first 3 months, but ongoing fees revert to standard tier pricing.
- Pros: Robust double-entry bookkeeping system, strong inventory management features, and support for multi-currency transactions on top tiers.
- Cons: Strict invoice sending caps on the entry-level plan make the $27 tier impractical for high-volume freelancers.
ZenBusiness Money Pro
ZenBusiness Money Pro is a financial management service aimed at sole proprietors and LLC operators who prefer to handle business formation, compliance, and ongoing expense tracking through one master platform.
- Pricing (as of 2026-10-06): $30 per month, offered as an add-on service.
- Pros: Unifies entity setup, compliance management, and income tracking; includes custom invoicing and tools to prepare your figures for tax time.
- Cons: It functions as a managed service and bundled tool set rather than standard standalone accounting software, meaning it is not designed for advanced double-entry accounting or complex inventory management.
Zoho Books
Zoho Books is part of the broader Zoho software ecosystem. It provides a full-featured bookkeeping interface with automated bank feeds, workflow rules, and detailed financial reports.
- Pricing (as of 2026-10-06): Free plan is $0 per month (limited to businesses earning under $50,000 in annual revenue). Standard costs $20 per month; Professional costs $50 per month; Premium costs $70 per month; Elite costs $150 per month; Ultimate costs $275 per month.
- Pros: Generous free plan for micro-businesses, strong automation capabilities, and deep native integration with other Zoho business apps.
- Cons: The revenue cap on the free tier forces successful side hustlers onto paid tiers, and the interface can feel overly complex for simple sole proprietorships.
Side-by-Side Tool Comparison
| Tool | Ongoing Monthly Price | Free Tier Available? | Key Best-Use Case |
|---|---|---|---|
| FreshBooks | $23/mo | No | Client invoicing & time tracking |
| QuickBooks Solopreneur | $20/mo | No | Schedule C & mileage tracking |
| Wave | $0/mo (Starter) | Yes | Budget-conscious side hustles |
| Xero | $27/mo | No | Scalable double-entry accounting |
| ZenBusiness Money Pro | $30/mo | No | Integrated formation & bookkeeping |
| Zoho Books | $0/mo (under $50k rev) | Yes | Automating workflows on a budget |
How to Choose the Right Tool for Your Freelance Setup
When selecting an income and expense tool, align the platform's capabilities with your specific business model:
- If you are starting a new LLC or sole proprietorship: Consider establishing your foundation first. Using a platform like ZenBusiness lets you register your business name, secure an EIN, and access bundled bookkeeping services without juggling multiple separate vendors.
- If you have zero budget: Wave gives you standard expense categories and unlimited invoicing without a monthly subscription fee.
- If you track significant road mileage: QuickBooks Solopreneur offers integrated GPS tracking to log vehicle expenses directly against your business revenue.
- If you need advanced project management: FreshBooks provides time tracking and client portals natively built into its billing flow.
Keeping accurate records protects your business against tax penalties and ensures you maximize your legal write-offs. Choose the workflow that requires the least manual effort, keep your personal and business accounts distinct, and retain all receipts in digital format according to legal recordkeeping windows.
Sources
- Internal Revenue Service, "How Long Should I Keep Records?"
- Internal Revenue Service, "Recordkeeping"
- Internal Revenue Service, "Publication 583, Starting a Business and Keeping Records"
- U.S. Department of Labor, "Fact Sheet #21: Recordkeeping Requirements under the Fair Labor Standards Act (FLSA)"
- California Department of Tax and Fee Administration, "Publication 116, Retaining Records"
- U.S. Small Business Administration, "Manage Your Business"