March 26, 2026Audits
What Are the Biggest Tax Mistakes People Make?
What are the biggest tax mistakes people make? Learn which filing errors, missing records, and missed IRS notices cause extra tax, penalties, and stress.
Author Profile
Alexander Chertok, ACCA, DipIFR
Audit Manager
Biography
Alexander Chertok is an Audit Manager who leads the audit team and oversees the full cycle of audit engagements performed under GAGAS (Government Auditing Standards / Yellow Book), Single Audit requirements under Uniform Guidance, GAAS (Generally Accepted Auditing Standards), and PCAOB standards.
With over 20 years of experience in accounting and finance, Alexander has developed deep expertise in external auditing, budgeting, management accounting, and financial control. Over the past decade, he has focused on senior audit roles across a range of industries, including retail, information technology, manufacturing, and nonprofit organizations.
Alexander holds DipIFR and ACCA qualifications and is certified in Government Auditing Standards (GAGAS / Yellow Book). He maintains ongoing professional development through annual continuing professional education in accounting, auditing, and ethics.
Areas of Expertise
Government Audits (GAGAS / Yellow Book)Single Audits (Uniform Guidance)GAAS and PCAOB Audit StandardsExternal Audit ManagementFinancial Controls and ComplianceBudgeting and Management AccountingAudit Process Leadership and Team Oversight
Articles
Latest insights from Alexander Chertok, ACCA, DipIFR
Audit, tax, and advisory resources from our team.
March 26, 2026Audits
Am I in Trouble If I Get Audited?
Am I in trouble if I get audited? Learn what an IRS audit usually means, when penalties may apply, and what steps to take after the notice arrives from the IRS.
March 26, 2026Audits
What's the Maximum You Can Claim Without Receipts?
What's the maximum you can claim without receipts? Learn the IRS rule, the narrow exceptions, and what records can still support a deduction in an audit.
March 26, 2026Audits
What happens if you are audited and don’t have receipts?
IRS audit no receipts: learn what the IRS may deny, which records can replace receipts, and the best steps to take before deductions are cut back or denied.
March 25, 2026Audits
What Is an ERISA Plan Audit?
Learn what an ERISA plan audit is, when it is required, what auditors review, and how plan sponsors can prepare for a smoother Form 5500 filing each year.
March 24, 2026Audits
What Is the Meaning of EBP Audit?
Learn the EBP audit meaning, when a plan audit is required, what auditors review, and what records plan sponsors should gather before filing Form 5500.
March 23, 2026Audits
What Is a Retirement Plan Audit?
What is a retirement plan audit? Learn when it is required, what auditors review, and how it connects to Form 5500 rules, deadlines, and sponsor duties.
March 22, 2026Audits
IRS Cost Segregation Audit Techniques Guide
Learn what the IRS cost segregation audit techniques guide covers, what examiners review, and how to build a stronger, better-documented study for an audit.
March 21, 2026Audits
How to Request an Audit on a Business
Learn how to request an audit on a business, including what to send in the first email or RFP and how to compare licensed CPA firms before moving ahead.
March 21, 2026Audits
Who can request an audit?
Who can request an audit? See who may start or require a nonprofit audit, when outside parties can demand one, and when to report issues to the IRS clearly.
March 21, 2026Audits
How do you write an email asking for an audit?
How do you write an email asking for an audit? Learn what to include, what firms need to quote the work, and when nonprofits should mention federal funding.
March 21, 2026Audits
How to request an audit of a nonprofit
Nonprofit audit request guide for boards and leaders. Learn who can request an audit, what to include in an email or RFP, and when state or federal rules apply.