Most startups don’t fail because of their product – they fail because of financial mistakes made early on. In the first year, founders are often focused on growth, hiring, and fundraising, while overlooking critical financial responsibilities such as tax compliance, payroll obligations, and cash flow management.

In the United States, even early-stage startups are subject to strict financial and regulatory requirements. Missing tax deadlines, misclassifying employees, or failing to track cash flow can quickly lead to penalties, legal exposure, and serious operational risks.

Understanding the most common financial mistakes -and how to avoid them – can be the difference between sustainable growth and costly setbacks

At ERB, we work closely with startups to prevent these issues before they arise – providing financial clarity, compliance support, and strategic guidance from day one.

Common First-Year Financial Mistakes

• Underpaying Taxes and Payroll Deductions: Startups frequently overlook the necessity of making quarterly tax payments or withholding income taxes. According to the IRS, if you do not make at least $1,000 in expected first quarter payments, penalties will be incurred for failing to make estimated tax payments. The IRS will also impose severe penalties for not electronically depositing withheld payroll taxes (withheld income, Social Security, and Medicare) in a timely manner.

• Why it is Important: Penalties range from 1% to 15% of the unpaid tax and can quickly accumulate. Indications of these problems include receiving notices of late payment and/or increased tax debts reflected on the accounting records.

• Remedial Action: Register for the Electronic Federal Tax Payment System (EFTPS) and schedule your payments. If you do not have an accountant or an e-filing provider, you should take steps necessary to ensure you do not fail to make timely payments.

• Mixing Personal and Business Finances: Business owners frequently maintain all of their personal and business finances in one account, which can lead to problems. According to the IRS, if you do not separate expenses incurred as a business from those incurred personally, it will be impossible to distinguish between legitimate business expenses and personal expenses and will result in disallowance of your deductions and trigger several red flags to the IRS.

• Why it is Important: If IRS auditors identify co-mingling of business and personal expenses, this could result in disallowed business expenses and back taxes. An indication of co-mingling would be a bank statement that reflects expenditures for personal items (e.g. rent and groceries) that have been paid from the business account.

• Remedial Action: Maintain separate business bank accounts and credit cards and reimburse any personal payments made by the owners of the business. Use accounting software to ensure your books accurately reflect only legitimate business expenses.

• Misclassification of Workers: Some startups misclassify employees as independent contractors to save on benefits and taxes. Generally, the IRS considers control over the employee’s work to define whether an individual is an employee or an independent contractor. If the business shows control over when, where and how the employee performs the work, they should be considered an employee rather than as an independent contractor. Misclassification of your employee as independent contractor can result in state and federal assessment of back taxes.

• Why it is Important: If you wilfully misclassify your employees, the DOL and IRS may assess multiple years of back payroll taxes plus penalties and may even impose criminal fines.

• Remedial Action: Appropriate classification of your employees is imperative. Refer to IRS guidance in determining whether an individual is an employee or independent contractor (see IRS Form SS-8). When in doubt, treat the individual as an employee and withhold taxes according to IRS guidelines.

• Skipping 1099 and Information Returns: Startups paying freelancers or vendors ≥$600 must file Form 1099-NEC. A common mistake is overlooking these filings. The IRS explicitly requires 1099-NEC for services from nonemployees (including law firms, vendors) paid ≥$600.
  Why it matters: Failure to file 1099s on time results in penalties ($50–$290/form) and IRS matching. Sign: bookkeeping lacking 1099 records or missing IRS Form 1096 (report of 1099s).
  Corrective action: Compile all contractor payments each quarter, issue 1099s by January 31, and e-file as needed. Use accounting software or a payroll service to generate 1099s for all qualifying payments.

• Neglecting Cash Flow / Budgeting: Many new businesses operate on a month-to-month basis without forecasting. The effect here is that they may end up with low runway; as such, 20%-40% of small businesses will fail during their first year (Bureau of Labor Statistics).

• Why This Is Important: Without a budget, companies can spend considerably more than their revenues which can then result in missing payroll or being unable to pay bills. Signs are bank balances below two months’ worth of operating expenses or frequently discussing cash-shortages.

• What To Do: Create a basic cash-flow forecast; to do that, you need to monitor your monthly income and expenses and then divide your existing cash by your monthly cash outflow to calculate how many months of runway you have. If you have less than 6 months, what you should do is either cut discretionary spending or seek capital from external sources.

• Assuming Licenses / Registration Will Happen Later: Startups frequently assume that getting their licenses and/or registering for taxes can wait. In fact, businesses should register for their state tax accounts (income/sales tax) and obtain any necessary permits to operate their businesses legally.

• Why This Is Important: Doing business without proper registration/ licenses could result in penalties and may hinder future sales. Signs of this include: No registered state tax ID for each jurisdiction in which you sell and no local business license for your locality.

• What To Do: As soon as possible, register for your Federal EIN, your state income tax ID, and your sales tax permit if you plan on selling goods and/or services. Also check applicable city/county requirements.

• Making Tax Returns Using Non-Professionals: Some founders attempt to complete their tax liability without assistance from an expert tax preparer. The IRS specifically encourages all individuals working in any capacity with a qualified tax preparer to help them with their tax situation as well as filing electronically to further reduce the chance of errors.

• Why This Is Important: Mistakes made to complete tax returns by individuals (i.e., non-professionals) can cause penalties or missed opportunities for benefits which could include capitalizing on a deduction for incurred expenses that the company was incurred during the startup period. Signs of tax mistakes will be if your tax forms are completed, but inaccurate or complex.

• What To Do: Hire a CPA who has experience with helping startup founders with tax-related transactions; ask him whether your tax return has been completed or set up your accounting system. Use payroll and/or compliance databases to process payroll and pay taxes; please remember though that you will ultimately be responsible for these errors regardless of whether you relied on the database provider or the person aiding.

Mistake Table

Action Plan (30/90-Day Checklist)

First 30 days:

• Separate finances: Open business bank account/credit card.
• Register & Document: Obtain EIN; register for payroll (Form 941) and state taxes; apply for necessary permits.
• Set up recordkeeping: Choose accounting software; hire a bookkeeper or accountant.
• Payroll setup: Decide on a payroll system; ensure tax withholdings (FICA, FUTA) are calculated.
• Cash audit: List current cash on hand and monthly expenses. Compute initial runway.

Next 30–90 days:

• Compliance check: Verify all IRS/State filings (business tax return due dates, quarterly reports). Pay any pending estimated taxes.
• Issue forms: Compile contractor payments and issue 1099s. File W-2s and W-3 with Social Security by Jan 31 (if year-end reached).
• Run budget vs. actual: Compare actuals to projections, adjust hiring/spend if overrunning.
• Forecast & fundraise: Refine cash flow forecast. If runway <6 months, plan cost cuts or capital raise.
• Seek professional help: Consult a CPA for tax planning and a lawyer for employee contracts or equity issues.

FAQ

What if I missed a payroll tax deposit?
Deposit taxes immediately with EFTPS. The IRS will impose a Failure to Deposit penalty (1–15% of unpaid tax, depending on lateness). You may also owe interest. To prevent repeat, automate deposits and consult a tax professional for any necessary penalty abatement.

How can we tell if a worker should be an employee?
The IRS looks at control: if you direct how/when work is done, it’s likely an employee. Misclassifying can trigger back payroll taxes and penalties. Use IRS guidance or Form SS-8, and if uncertain, treat them as an employee and withhold taxes.

Do I need to file 1099s for all freelancers?
Yes. If you paid an independent contractor $600 or more for services in a year, you must file Form 1099-NEC with the IRS. Missing this can incur fines. Keep diligent payment records to prepare 1099s by the Jan 31 deadline.

Can hiring a payroll service avoid all these problems?
A payroll service can help compute and file taxes, but you remain responsible. Even if they err, the IRS can hold you accountable. Always review payroll reports and ensure timely payments yourself.

How do we know if our startup is running out of cash?
Track months of runway (current cash ÷ monthly burn). If it drops below ~6 months, you’re at risk. Also monitor key metrics like negative cash flow each month. Regular forecasting lets you spot a shortfall early and adjust before crisis.