(a) Date of assessment with respect to federal change.
1. Taxpayer self-assessment. The tax is deemed to be assessed with regard to a report of federal change under 830 CMR 62C.30.1(3), at the time when the report of federal change is duly filed.
2. Commissioner deficiency assessment. For the purposes of 830 CMR 62C.30.1, the tax is assessed upon the issuance of a Notice of Assessment to a taxpayer, or the entry in the Commissioner's books and records of an amount due from the taxpayer, if such entry predates the Notice of Assessment.
(b) Determination of assessment amount with respect to federal change.
1. Taxpayer self-assessment. Taxes are deemed to be assessed with the taxpayer's calculation and declaration of the tax due, as provided under M.G.L. c. 62C, § 26(a), reported as prescribed by the Commissioner, by the taxpayer or the taxpayer's representative and duly filed with the Commissioner. The deemed assessment is the amount due before any offsets are claimed by the taxpayer.
2. Deficiency assessment by the Commissioner.
a. Full amount of tax not assessed. If the Commissioner determines from the taxpayer's report of federal change or upon investigation that the full amount of tax resulting from the federal change has not been assessed or deemed to be assessed, the Commissioner will assess, notwithstanding any limitation in M.G.L. c. 62C, § 26, the full amount of tax with interest, as provided in M.G.L. c. 62C, § 32, from the due date of the original return. Any assessment under 830CMR 62C.30.1(4)(b)2. will be made in the manner provided in 830 CMR 62C.26.1.
b. Limitation period for assessment. The Commissioner will make any deficiency assessment within one year of receiving a taxpayer's report of federal change, as provided in 830 CMR 62C.30.1(3). Where no report of federal change is filed as provided in 830 CMR 62C.30.1(3), the Commissioner will make any deficiency assessments within two years of receiving information from the federal government that it has made a final determination of a taxpayer's federal taxable income, federal tax credits, or federal taxable estate that is different from the amount originally reported. The Commissioner has two years from receipt of information from the federal government to make deficiency assessments.
c. Limitation on items assessed. Any assessment made under 830 CMR 62C.30.1(4)(b)2. is limited to changes in taxpayer's tax liability directly attributable to changes, adjustments, or corrections to the taxpayer’s federal taxable income or federal credits or federal taxable estate resulting in a final determination.