BIR Form 1601-C is the monthly withholding tax return on compensation filed by employers and withholding agents to report income tax withheld from employee salaries, wages, and other compensation. This form is mandatory for all employers subject to withholding tax obligations under the National Internal Revenue Code (NIRC) of 1997, as amended. The return must be filed with the Bureau of Internal Revenue (BIR) on or before the 10th day of the month following the month of withholding.
Purpose & Legal Basis
BIR Form 1601-C serves as the official monthly remittance return for withholding tax on compensation. It documents the total compensation paid to employees and the corresponding income tax withheld during the month. The legal basis for this requirement is found in:
- NIRC Section 79 – Requirement to withhold income tax on compensation
- NIRC Section 226 – Authority of the Commissioner to require returns and statements
- Revenue Regulation (RR) No. 2-98 – Implementing rules on withholding of income tax on compensation
- RR No. 15-2010 – Amendments to withholding tax procedures
Employers must remit the withheld taxes simultaneously with the filing of Form 1601-C through authorized payment channels.
Who Must File
The following entities must file BIR Form 1601-C:
- All employers – Private corporations, partnerships, sole proprietorships, and other business entities that employ workers
- Government agencies and instrumentalities – National government agencies, local government units, and government-owned and controlled corporations (GOCCs)
- Non-profit organizations – Educational institutions, charitable organizations, and religious entities that pay compensation to employees
- Withholding agents – Any person or entity required by law to withhold income tax on compensation
Even employers with no employees during a particular month must file a nil return (Form 1601-C with zero amounts) if they are registered as employers with the BIR.
When to File
Filing Deadline: On or before the 10th day of the month following the month of withholding.
Examples:
- For compensation paid in January, file on or before February 10
- For compensation paid in December, file on or before January 10 of the following year
If the 10th falls on a weekend or holiday, the deadline is extended to the next working day. Late filing incurs penalties as prescribed by the BIR.
Line-by-Line Instructions
Header Information:
- Taxpayer Identification Number (TIN): Enter the employer's 9-digit TIN as registered with the BIR
- Taxpayer Name: Enter the registered business name or legal name of the employer
- Address: Enter the principal business address registered with the BIR
- Month/Year of Return: Indicate the month and year for which compensation was paid (e.g., "January 2024")
Part I – Summary of Withholding Tax on Compensation:
- Line 1 – Total Compensation Paid: Enter the total gross compensation (salaries, wages, bonuses, allowances, and other benefits) paid to all employees during the month. Include both taxable and non-taxable compensation. Example: PHP 500,000
- Line 2 – Less: Non-Taxable Compensation: Deduct amounts exempt from income tax, such as the statutory minimum wage, 13th month pay (up to one month's salary), and other statutory benefits. Example: PHP 50,000
- Line 3 – Taxable Compensation: Subtract Line 2 from Line 1. This is the amount subject to withholding tax. Example: PHP 450,000
- Line 4 – Income Tax Withheld: Enter the total income tax withheld from employees' compensation during the month, calculated using the BIR withholding tax tables. Example: PHP 45,000
Part II – Breakdown by Employee (Alphalist):
- Employee Name: Full legal name of each employee
- TIN/SSS/GSIS Number: The employee's tax identification number or social security number
- Gross Compensation: Total compensation paid to the employee during the month
- Non-Taxable Compensation: Amounts exempt from withholding tax for that employee
- Taxable Compensation: Gross minus non-taxable compensation
- Income Tax Withheld: Tax withheld from that employee's compensation
The alphalist must be attached to the return and reconciled with the summary in Part I.
Part III – Certification:
- Authorized Representative Signature: The return must be signed by the employer, authorized officer, or duly authorized representative
- Date of Filing: Enter the date the return is submitted to the BIR
- Declaration: The signatory certifies that the information provided is true, correct, and complete under penalties of perjury
Common Filing Errors
Taxpayers frequently make the following mistakes when filing Form 1601-C:
- Incorrect TIN Format: Entering the TIN with incorrect formatting or using an outdated TIN. Always verify the TIN matches the BIR registration.
- Misclassification of Compensation: Failing to properly distinguish between taxable and non-taxable compensation. Non-taxable items such as statutory minimum wage and 13th month pay must be excluded.
- Arithmetic Errors: Miscalculating the total compensation, taxable compensation, or withholding tax. Ensure all figures are accurately summed and reconciled.
- Missing Alphalist: Submitting the return without the required employee alphalist (BIR Form 1604-C), which details compensation and withholding for each employee.
- Late Filing: Filing after the 10th of the following month without valid justification, resulting in penalties.
- Incomplete Information: Omitting required fields such as employee names, TINs, or withholding amounts.
- Discrepancies with Payroll Records: Figures on Form 1601-C not matching the employer's payroll records or the alphalist, causing audit issues.
- Failure to Remit Withheld Taxes: Filing the return without simultaneously remitting the withheld taxes through authorized payment channels.
Required Attachments
The following documents must be attached to BIR Form 1601-C:
- BIR Form 1604-C (Alphalist of Employees): A detailed list of all employees, their compensation, and withholding tax for the month. This form must reconcile with the summary figures on Form 1601-C.
- Proof of Payment: Official receipt or payment confirmation showing that the withheld taxes have been remitted to the BIR or an authorized agent bank (AAB).
- Payroll Register or Payroll Summary: Supporting documentation showing the calculation of gross compensation, deductions, and net pay for all employees.
- Authorization Letter (if applicable): If the return is filed by an authorized representative or accountant, a notarized authorization letter from the employer must be submitted.
How to File
Filing Methods:
- eFPS (Electronic Filing and Payment System): The primary filing method. Employers can file Form 1601-C and remit withheld taxes online through the BIR's eFPS portal at www.efps.bir.gov.ph. This method is mandatory for large employers and recommended for all taxpayers.
- eBIR Forms: Alternative online filing platform where employers can submit Form 1601-C electronically. Access is available through the BIR website.
- Authorized Agent Bank (AAB): Employers may file and remit through participating banks designated as AABs. The bank will transmit the return to the BIR electronically.
- Manual Filing (Limited): In exceptional cases where electronic filing is not feasible, manual filing at the BIR office is permitted, though this is increasingly discouraged. The return must be filed in duplicate with all required attachments.
Steps to File Online (eFPS):
- Log in to the eFPS portal using your BIR credentials
- Select "File Return" and choose Form 1601-C
- Enter the month and year of the return
- Input all required information from the form
- Upload the alphalist (Form 1604-C) and supporting documents
- Review all entries for accuracy
- Submit the return electronically
- Proceed to payment and remit the withheld taxes
- Retain the official receipt and confirmation number for records
Penalties for Late Filing
Failure to file Form 1601-C on or before the prescribed deadline results in penalties under NIRC Section 248:
- Failure to File Penalty: 25% of the tax due (withheld tax amount) for each month of delay, with a minimum of PHP 1,000 per return
- Failure to Pay Penalty: 25% of the unpaid withheld tax for each month of delay, with a minimum of PHP 1,000
- Surcharge: An additional 20% surcharge may be imposed if the failure is deemed willful or fraudulent
- Interest: 12% per annum on unpaid taxes, computed from the due date until full payment
Example: If an employer withholds PHP 50,000 in taxes but files Form 1601-C 30 days late without remitting, the penalty would be 25% × PHP 50,000 = PHP 12,500, plus 12% annual interest on the unpaid PHP 50,000.
Penalties may be reduced or waived if the taxpayer files a request for reconsideration with valid justification (e.g., force majeure, system outage) within 30 days of receiving the assessment.
Additional Considerations
Reconciliation with Annual Returns: The monthly Form 1601-C filings must reconcile with the annual BIR Form 1601-EQ (Annual Withholding Tax Return on Compensation) filed by April 15 of the following year. Discrepancies may trigger audits.
Amended Returns: If errors are discovered after filing, employers may file an amended Form 1601-C (marked "AMENDED") within the same month or in the following month. Amended returns must include an explanation of the corrections.
Nil Returns: Employers with no employees or no compensation paid during a month must still file a nil return (Form 1601-C with all amounts as zero) to maintain compliance.
Record Retention: Employers must retain payroll records, alphalists, and proof of payment for at least three (3) years for BIR audit purposes.