S. 9(1)(i): Income deemed to accrue or arise in India-Business connection-Non-resident-Permanent establishment-Service permanent establishment-Employees required to be physically present and furnish services in India exceeding 90 days (or 30 days for related enterprises) in a fiscal year-Services furnished only for 44 days after excluding vacation, business development and common days-No service permanent establishment-Business profits not taxable in India.-Virtual service permanent establishment-Concept not provided under Double Taxation Avoidance Agreement or officially endorsed in India-Requirement of physical rendition of service alone to be applied-Return-Delay in filing-Interest-Assessee contending return filed within extended due date-Matter remanded for verification-Interest-Advance tax-Income received after deduction of tax at source-Levy of interest for failure to pay advance tax not called for-Income-Accrual-Amounts appearing in Form 26AS cannot automatically be treated as income-Assessing Officer to verify and grant corresponding credit of tax deducted at source if payments not actually received. DTAA-India-Singapore. [S. 4, 5 , 234A , 234B Art. 5(6) , Form No 26AS]