$2,000 × 13 = $26,000 annual → ISR $173.08/month (15% over $11,000). Not Nicaragua 12-month IR.
The 0.9% Additional Medicare Tax on wages above your filing-status threshold: $250,000 joint, $125,000 married filing separately, $200,000 any other case.
Calculate Costa Rica aguinaldo with monthly salary, months worked, and additional earnings.
Calculate your aguinaldo (Christmas bonus) under El Salvador labor law
Salary × 13. Not Nicaragua IR (12 months + INSS).
$2,000 → $173.08/month.