🧾 Advance Income Tax (AIT) / Withholding Tax (WHT) in Sri Lanka – Complete Guide

ByEntrepreneur

📅 Last Updated: March 2026

This article is continuously updated with the latest Advance Income Tax (AIT) and Withholding Tax (WHT) regulations in Sri Lanka, including applicable rates, responsibilities, and compliance requirements issued by the Inland Revenue Department.

🔄 Latest Updates

Key Information (Current)

  • Withholding Tax (WHT) applies to specific payments such as:
    • Interest
    • Rent
    • Dividends
    • Service payments (in certain cases)
  • Advance Income Tax (AIT) is deducted at source as a prepayment of income tax
  • Applicable rates vary depending on the type of payment and recipient

👉 This section will be updated if tax rules change.

📘 What is AIT / WHT?

🔹 Withholding Tax (WHT)

WHT is a tax deducted at the point of payment by the payer and remitted to the Inland Revenue Department (IRD).

🔹 Advance Income Tax (AIT)

AIT is a form of withholding tax that acts as an advance payment of income tax for the recipient.

👉 In practice, both involve deducting tax before making payment.

👤 Who Needs to Deduct WHT?

You must deduct WHT if:

✔ You are making specified payments such as:

  • Interest
  • Rent
  • Dividends
  • Certain service fees

✔ You are:

  • A company
  • A business entity
  • A withholding agent

📊 Common WHT / AIT Rates in Sri Lanka

Payment TypeTypical Rate
Interest income5%
Rent payments10%
Dividends15%
Service paymentsVaries

👉 Actual rates depend on:

  • Nature of payment
  • Resident vs non-resident status
  • Applicable exemptions

🧮 How WHT Works (Example)

Example:

  • Rent paid: LKR 100,000
  • WHT rate: 10%

👉 WHT deducted = LKR 10,000
👉 Net payment to landlord = LKR 90,000

👉 LKR 10,000 must be paid to IRD.

📂 Types of Payments Subject to WHT

1. Interest

  • Bank interest
  • Deposits

2. Rent

  • Land and building rentals

3. Dividends

  • Paid to shareholders

4. Service Payments

  • Certain professional or contractual payments

⚠️ Important Concept: Final vs Advance Tax

TypeMeaning
Final WHTNo further tax liability
AITCredited against final income tax

👉 Misunderstanding this is a common issue.

📅 Filing & Payment Deadlines

🔹 Payment of WHT

  • Must be paid to IRD on or before the 15th of following month

🔹 Returns

  • Periodic returns must be submitted

👉 Late payment results in penalties.

📄 Documentation Requirements

  • WHT deduction schedules
  • Payment vouchers (DIN if required)
  • Supporting invoices/agreements

⚠️ Common Mistakes

🚫 Not deducting WHT when required
🚫 Applying incorrect rate
🚫 Paying full amount without deduction
🚫 Missing deadlines
🚫 Poor documentation

📉 Business Impact

  • Affects cash flow of recipients
  • Compliance burden on payer
  • Important for:
    • Landlords
    • Investors
    • Service providers

📜 Historical Context

  • WHT system has evolved with tax reforms
  • Some exemptions introduced/removed over time
  • Increasing focus on tax collection at source

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