1. Mismatched Income
IRS computers compare 1099 forms to individual tax returns automatically. Any discrepancy triggers an immediate flag. Discrepancies lead to automated under-reporter notices.
Required Actions:
- Collect every Form 1099-NEC received.
- Collect every Form 1099-MISC received.
- Collect every Form 1099-K received.
- Verify 1099 amounts against bank deposits.
- Match Social Security Numbers on forms to your records.
- Contact issuers for corrected forms if amounts differ.
- Report all income even if a 1099 was not issued.
- Reconcile gross receipts with internal accounting software.
- Verify backup withholding amounts.
- Check Form 1099-INT for interest income accuracy.
- Check Form 1099-DIV for dividend consistency.
- Compare Form 1099-B against brokerage statements.
- Account for crypto transactions on Form 1099-DA.
- Document foreign income on FinCEN Form 114 if applicable.
2. Rounded Numbers
Exact figures are mandatory. Estimated or rounded numbers suggest guesswork. IRS auditors target returns containing multiple figures ending in "0" or "00".
Required Actions:
- Use actual cents for every entry.
- Total expenses from original receipts.
- Stop estimating utility costs.
- Calculate exact mileage via GPS logs.
- Record precise charitable donation values.
- Maintain physical backups of receipts.
- Use A5 Binder Notebooks for manual expense logging.
- Audit your own general ledger for "round number" clusters.
- Transition from estimates to data-driven accounting.
- Verify supply costs against invoice totals.
- Log exact meal costs for business travel.
- Record precise postage and shipping fees.
- Document specific professional service fees paid.
- Verify software subscription costs to the penny.
3. Platform Reporting
The IRS now monitors high-volume digital payment platforms. Venmo, PayPal, and Cash App report business transactions. Failure to report 1099-K income is a high-risk compliance error.
Required Actions:
- Separate personal and business accounts on all platforms.
- Review 1099-K forms for total gross volume.
- Reconcile platform fees as business expenses.
- Identify personal transfers to exclude from business income.
- Document refunds processed through digital apps.
- Keep screenshots of transaction details.
- Verify platform-reported income against monthly bank statements.
- Adjust for chargebacks and returns.
- Track sales tax collected via platforms.
- Ensure platform business names match LLC registration.
- Use Registered Agent Services to maintain business standing for platform compliance.
- Audit secondary platforms like Etsy or eBay for unreported sales.
- Verify merchant category codes are accurate.
- Report "Big Beautiful Bill" related tax credits accurately for digital operations.
4. Home Office
The home office deduction requires exclusive use. Mixed-use spaces do not qualify. Claiming a deduction for a guest room or kitchen table invites audit.
Required Actions:
- Measure the exact square footage of the dedicated office.
- Measure the total square footage of the home.
- Calculate the business use percentage.
- Photograph the workspace to prove "exclusive use."
- Maintain a log of activities performed in the office.
- Deduct mortgage interest based on calculated percentage.
- Deduct property taxes based on calculated percentage.
- Deduct utilities based on calculated percentage.
- Deduct home insurance based on calculated percentage.
- Depreciate the office portion of the home structure.
- Track repairs specific to the office space.
- Ensure no personal items are stored in the workspace.
- Verify the office is the principal place of business.
- Document meeting schedules if clients visit the home.
5. Early Filing
Filing in January or early February often results in errors. Financial institutions frequently issue corrected 1099s in March. Filing before receiving all documents requires filing an amended return later.
Required Actions:
- Wait for all 1099-B brokerage statements.
- Wait for Schedule K-1 forms from partnerships.
- Wait for Schedule K-1 forms from S-corporations.
- Wait for final mortgage interest statements.
- Check online portals for digital-only tax documents.
- Verify no "corrected" forms have arrived in the mail.
- Cross-reference MCG Service guidelines for filing timelines.
- Set a filing date after March 15 for complex portfolios.
- Use Handmade A4 Folders to organize incoming late forms.
- Review prior-year forms to ensure all current-year counterparts are present.
- Confirm receipt of state-level tax documents.
- Verify local business tax certificate renewals.
- Check for late-arriving tuition statements (1098-T).
- Monitor IRS news for last-minute legislative changes.
6. Status Errors
Incorrect filing status affects standard deduction amounts and tax brackets. Head of Household status is frequently claimed incorrectly. Mistakenly filing as Single instead of Married Filing Separately can increase tax liability.
Required Actions:
- Confirm legal marital status as of December 31.
- Verify "support" requirements for Head of Household.
- Identify qualifying dependents by Social Security Number.
- Verify residency requirements for dependents.
- Check "Married Filing Separately" impact on student loan interest.
- Analyze tax liability for "Married Filing Jointly" versus "Separately."
- Confirm divorce decree dates for filing status changes.
- Ensure dependent names match Social Security cards exactly.
- Validate qualifying widow(er) eligibility periods.
- Review "Big Beautiful Bill" adjustments to standard deductions.
- Check for age-related deduction increases.
- Verify blind taxpayer deduction eligibility.
- Confirm dependent care credit qualifications.
- Update addresses with the IRS using Form 8822.
7. Math Mistakes
Manual calculation errors are the most common reason for IRS notices. Transposed numbers or incorrect additions trigger automated corrections. Automated corrections often result in reduced refunds or increased balance due.
Required Actions:
- Use professional tax software for all calculations.
- Double-check Social Security Numbers.
- Double-check Bank Routing Numbers for direct deposit.
- Double-check Bank Account Numbers.
- Verify math on self-employment tax schedules.
- Confirm Qualified Business Income (QBI) deduction math.
- Check carryover loss calculations from previous years.
- Validate depreciation schedule calculations.
- Verify estimated tax payments already made.
- Audit payroll tax calculations for accuracy.
- Confirm sales tax deduction math if itemizing.
- Review MCG Service Additional Services for professional review.
- Verify healthcare premium tax credit reconciliations.
- Cross-check numbers between Form 1040 and all attached schedules.
Compliance Checklist
Follow these steps for immediate correction.
- Review all 2025 records.
- Gather physical receipts.
- Organize documents in Business Folders.
- Download digital platform statements.
- Verify LLC legal standing via Registered Agent Service.
- Request missing 1099s.
- Verify SSN accuracy.
- Check bank account details.
- Calculate home office dimensions.
- Log final business mileage.
- Reconcile PayPal/Venmo business activity.
- Verify filing status eligibility.
- Check for corrected tax forms.
- Review 2026 tax law updates.
- E-file for faster processing.
- Archive a copy of the final return.
- Maintain records for seven years.
