New York State Department of Taxation and Finance - Corporate, personal, sales and other NYS tax and finance related information, with links to what they consider related sites Internal Revenue Service - The IRS is the US government agency responsible for tax collection and tax law enforcement. National Society of Accountants - NSA and its affiliates represent more than 30,000 independent practitioners who provide accounting, tax, auditing, financial and estate planning, and management services to 19 million individuals and businesses. Paycheckcity.com - Net Pay Calculator - Check your weekly/monthly gross to net payroll eloan.com - Amortization Calculator - This calculator will display the breakdown between principal and interest in payments on your loan. You can choose to add extra principal payments every month or once per year.