Detailed statutory analysis & overview
Cross-border remote payroll in APAC turns on one principle that most employment contracts never mention: employment income is generally taxed where the work is physically performed, not where the employer is incorporated or where the salary is paid from. Article 15 of the OECD Model Convention, which the region's treaties broadly follow, gives the primary taxing right to the country of residence but hands it to the country where the duties are exercised unless three conditions are met simultaneously. That means an employee who relocates their laptop across a border can shift their entire tax base without anyone in payroll noticing, and can simultaneously create a filing and withholding obligation for the employer in a country where it has no entity. Social security follows a different and entirely separate rule set, staying in the home scheme only where a totalisation agreement exists, and APAC coverage is patchy, with Singapore and Malaysia notably having no such network. This calculator models the employee's own exposure and flags the employer-side registration, notification, and tax clearance obligations that typically surface a year too late.