| Abbreviation | Definition |
|---|---|
| NIIT | Net Investment Income Tax |
| NIT | Negative Income Tax |
| NITP | National Institute of Tax Professionals |
| NMTC | New Markets Tax |
| NMTC | New Markets Tax Credit |
| NMTC | New Markets Tax Credits |
| NMTR | New Mothers Tax Relief |
| NOPBT | Net Operating Profit Before Taxes |
| NPATA | Net Profit After Tax Amortisation |
| NPT | Net Profits Tax |
| NPTC | National Premium Tax Conference |
| NPTR | New Personal Tax Regime |
| NRST | Non Resident Shareholders Tax |
| NRST | Non Resident Speculation Tax |
| NRTC | Neighborhood Revitalization Tax Credit |
| NRTC | Non Refundable Tax Credits |
| NRWT | Non Resident Withholding Tax |
| NSST | Nova Scotia Sales Tax |
| NST | National Sales Tax |
| NSTP | National Society of Tax Professionals |