Del. Code Ann. tit. 30, § 1102
(a) (1) For taxable years beginning before January 1, 1985, the amount of tax shall be determined as follows:
1.4% of the amount of taxable income not in excess of $1,000;
2.0% of the amount of taxable income in excess of $1,000, but not in excess of $2,000;
3.0% of the amount of taxable income in excess of $2,000, but not in excess of $3,000;
4.2% of the amount of taxable income in excess of $3,000, but not in excess of $4,000;
5.2% of the amount of taxable income in excess of $4,000, but not in excess of $5,000;
6.2% of the amount of taxable income in excess of $5,000, but not in excess of $6,000;
7.2% of the amount of taxable income in excess of $6,000, but not in excess of $8,000;
8.0% of the amount of taxable income in excess of $8,000, but not in excess of $10,000;
8.2% of the amount of taxable income in excess of $10,000, but not in excess of $15,000;
8.4% of the amount of taxable income in excess of $15,000, but not in excess of $20,000;
8.8% of the amount of taxable income in excess of $20,000, but not in excess of $25,000;
9.4% of the amount of taxable income in excess of $25,000, but not in excess of $30,000;
11.0% of the amount of taxable income in excess of $30,000, but not in excess of $40,000;
12.2% of the amount of taxable income in excess of $40,000, but not in excess of $50,000;
13.5% of the amount of taxable income in excess of $50,000.
(2) For taxable years beginning after December 31, 1984, and before January 1, 1986, the amount of tax shall be determined as follows:
1.3% of the amount of taxable income not in excess of $1,000;
1.8% of the amount of taxable income in excess of $1,000, but not in excess of $2,000;
2.7% of the amount of taxable income in excess of $2,000, but not in excess of $3,000;
3.8% of the amount of taxable income in excess of $3,000, but not in excess of $4,000;
4.7% of the amount of taxable income in excess of $4,000, but not in excess of $5,000;
5.6% of the amount of taxable income in excess of $5,000, but not in excess of $6,000;
6.5% of the amount of taxable income in excess of $6,000, but not in excess of $8,000;
7.2% of the amount of taxable income in excess of $8,000, but not in excess of $10,000;
7.4% of the amount of taxable income in excess of $10,000, but not in excess of $15,000;
7.6% of the amount of taxable income in excess of $15,000, but not in excess of $20,000;
7.9% of the amount of taxable income in excess of $20,000, but not in excess of $25,000;
8.5% of the amount of taxable income in excess of $25,000, but not in excess of $30,000;
9.9% of the amount of taxable income in excess of $30,000, but not in excess of $40,000;
10.7% of the amount of taxable income in excess of $40,000.
(3) For taxable years beginning after December 31, 1985, and before January 1, 1987, the amount of tax shall be determined as follows:
1.2% of the amount of taxable income not in excess of $1,000;
1.6% of the amount of taxable income in excess of $1,000, but not in excess of $2,000;
2.5% of the amount of taxable income in excess of $2,000, but not in excess of $3,000;
3.5% of the amount of taxable income in excess of $3,000, but not in excess of $4,000;
4.3% of the amount of taxable income in excess of $4,000, but not in excess of $5,000;
5.1% of the amount of taxable income in excess of $5,000, but not in excess of $6,000;
5.9% of the amount of taxable income in excess of $6,000, but not in excess of $8,000;
6.6% of the amount of taxable income in excess of $8,000, but not in excess of $10,000;
6.7% of the amount of taxable income in excess of $10,000, but not in excess of $15,000;
6.9% of the amount of taxable income in excess of $15,000, but not in excess of $20,000;
7.2% of the amount of taxable income in excess of $20,000, but not in excess of $25,000;
7.7% of the amount of taxable income in excess of $25,000, but not in excess of $30,000;
9.0% of the amount of taxable income in excess of $30,000, but not in excess of $40,000;
9.7% of the amount of taxable income in excess of $40,000.
(4) For taxable years beginning after December 31, 1986, and before January 1, 1988, the amount of tax shall be determined as follows:
1.0% of the amount of taxable income not in excess of $1,000;
1.4% of the amount of taxable income in excess of $1,000, but not in excess of $2,000;
2.3% of the amount of taxable income in excess of $2,000, but not in excess of $3,000;
3.2% of the amount of taxable income in excess of $3,000, but not in excess of $4,000;
3.9% of the amount of taxable income in excess of $4,000, but not in excess of $5,000;
4.6% of the amount of taxable income in excess of $5,000, but not in excess of $6,000;
5.4% of the amount of taxable income in excess of $6,000, but not in excess of $8,000;
6.0% of the amount of taxable income in excess of $8,000, but not in excess of $10,000;
6.1% of the amount of taxable income in excess of $10,000, but not in excess of $15,000;
6.3% of the amount of taxable income in excess of $15,000, but not in excess of $20,000;
6.5% of the amount of taxable income in excess of $20,000, but not in excess of $25,000;
7.0% of the amount of taxable income in excess of $25,000, but not in excess of $30,000;
8.2% of the amount of taxable income in excess of $30,000, but not in excess of $40,000;
8.8% of the amount of taxable income in excess of $40,000.
(5) For taxable years beginning after December 31, 1987, and before January 1, 1996, the amount of tax shall be determined as follows:
3.2% of taxable income in excess of $2,000, but not in excess of $5,000;
5.0% of taxable income in excess of $5,000, but not in excess of $10,000;
6.0% of taxable income in excess of $10,000, but not in excess of $20,000;
6.6% of taxable income in excess of $20,000, but not in excess of $25,000;
7.0% of taxable income in excess of $25,000, but not in excess of $30,000;
7.6% of taxable income in excess of $30,000, but not in excess of $40,000;
7.7% of taxable income in excess of $40,000.
(6) For taxable years beginning after December 31, 1995, and before January 1, 1997, the amount of tax shall be determined as follows:
3.2% of taxable income in excess of $2,000 but not in excess of $5,000;
5.0% of taxable income in excess of $5,000 but not in excess of $10,000;
6.0% of taxable income in excess of $10,000 but not in excess of $20,000;
6.35% of taxable income in excess of $20,000 but not in excess of $25,000;
6.65% of taxable income in excess of $25,000 but not in excess of $30,000;
7.1% of taxable income in excess of $30,000.
(7) For taxable years beginning after December 31, 1996, and before January 1, 1999, the amount of tax shall be determined as follows:
3.1% of taxable income in excess of $2,000 but not in excess of $5,000;
4.85% of taxable income in excess of $5,000 but not in excess of $10,000;
5.8% of taxable income in excess of $10,000 but not in excess of $20,000;
6.15% of taxable income in excess of $20,000 but not in excess of $25,000;
6.45% of taxable income in excess of $25,000 but not in excess of $30,000;
6.9% of taxable income in excess of $30,000.
(8) For taxable years beginning after December 31, 1998, and before January 1, 2000, the amount of tax shall be determined as follows:
2.60% of taxable income in excess of $2,000 but not in excess of $5,000;
4.30% of taxable income in excess of $5,000 but not in excess of $10,000;
5.20% of taxable income in excess of $10,000 but not in excess of $20,000; and
5.60% of taxable income in excess of $20,000 but not in excess of $25,000.
(10) For taxable years beginning after December 31, 1999, and before January 1, 2010, the amount of tax shall be determined as follows:
2.2% of taxable income in excess of $2,000 but not in excess of $5,000;
3.9% of taxable income in excess of $5,000 but not in excess of $10,000;
4.8% of taxable income in excess of $10,000 but not in excess of $20,000;
5.2% of taxable income in excess of $20,000 but not in excess of $25,000; and
5.55% of taxable income in excess of $25,000 but not in excess of $60,000.
(12) For taxable years beginning after December 31, 2009, and before January 1, 2012, the amount of tax shall be determined as follows:
2.2% of taxable income in excess of $2,000 but not in excess of $5,000;
3.9% of taxable income in excess of $5,000 but not in excess of $10,000;
4.8% of taxable income in excess of $10,000 but not in excess of $20,000;
5.2% of taxable income in excess of $20,000 but not in excess of $25,000;
5.55% of taxable income in excess of $25,000 but not in excess of $60,000; and
6.95% of taxable income in excess of $60,000.
(13) For taxable years beginning after December 31, 2011, and before January 1, 2014, the amount of tax shall be determined as follows:
2.2% of taxable income in excess of $2,000 but not in excess of $5,000;
3.9% of taxable income in excess of $5,000 but not in excess of $10,000;
4.8% of taxable income in excess of $10,000 but not in excess of $20,000;
5.2% of taxable income in excess of $20,000 but not in excess of $25,000;
5.55% of taxable income in excess of $25,000 but not in excess of $60,000; and
6.75% of taxable income in excess of $60,000.
(14) For taxable years beginning after December 31, 2013, the amount of tax shall be determined as follows:
2.2% of taxable income in excess of $2,000 but not in excess of $5,000;
3.9% of taxable income in excess of $5,000 but not in excess of $10,000;
4.8% of taxable income in excess of $10,000 but not in excess of $20,000;
5.2% of taxable income in excess of $20,000 but not in excess of $25,000;
5.55% of taxable income in excess of $25,000 but not in excess of $60,000; and
6.6% of taxable income in excess of $60,000.
(b) (1) In addition to the tax imposed under subsection (a) of this section, there is hereby imposed a separate tax in the amount determined in paragraph (b)(2) of this section, on the ordinary income portion of a lump sum distribution received by every resident individual, estate or trust.
(c) The tax rates established by paragraph (a)(4) of this section shall be revoked effective January 1, 1988, unless the Secretary of Labor has, on or before June 10, 1987, made a written determination, submitted to the Governor, Speaker of the House and President Pro Tempore of the Senate, that the total full-time equivalent employment in the State, as regularly reported by the State Department of Labor, has averaged an annual increase of 6,000 full-time equivalent jobs in nonagricultural wage and salary employment as reported by the Delaware Department of Labor during the period from June 1, 1984, through May 31, 1987. Once the condition of this subsection has been satisfied, there shall be no revocation of the paragraph (a)(4) of this section rates by reason of this subsection. In the event of any revocation of the tax rates established by paragraph (a)(4) of this section, the following rates shall become effective:
1.0% of the amount of taxable income not in excess of $1,000;
1.4% of the amount of taxable income in excess of $1,000, but not in excess of $2,000;
2.3% of the amount of taxable income in excess of $2,000, but not in excess of $3,000;
3.2% of the amount of taxable income in excess of $3,000, but not in excess of $4,000;
3.9% of the amount of taxable income in excess of $4,000, but not in excess of $5,000;
4.6% of the amount of taxable income in excess of $5,000, but not in excess of $6,000;
5.4% of the amount of taxable income in excess of $6,000, but not in excess of $8,000;
6.0% of the amount of taxable income in excess of $8,000, but not in excess of $10,000;
6.1% of the amount of taxable income in excess of $10,000, but not in excess of $15,000;
6.3% of the amount of taxable income in excess of $15,000, but not in excess of $20,000;
6.5% of the amount of taxable income in excess of $20,000, but not in excess of $25,000;
7.0% of the amount of taxable income in excess of $25,000, but not in excess of $30,000;
8.2% of the amount of taxable income in excess of $30,000, but not in excess of $40,000;
9.2% of the amount of taxable income in excess of $40,000, but not in excess of $50,000;
10.1% of the amount of taxable income in excess of $50,000.
(d) (1) In lieu of the tax imposed by subsection (a) of this section there is imposed for each taxable year on the tax table income of every individual whose tax table income for the taxable year does not exceed $60,000, or such lesser amount as the Director may determine but in any event not less than $20,000, a tax determined under tables, applicable to such taxable years, which shall be prescribed by the Director of Revenue. The amounts of tax prescribed in such tables shall be computed on the basis of the rates prescribed by subsection (a) of this section.
30 Del. C. 1953, § 1102; 57 Del. Laws, c. 737, § 1; 58 Del. Laws, c. 300, §§ 1, 2, 4; 59 Del. Laws, c. 152, § 1; 62 Del. Laws, c. 23, § 1; 62 Del. Laws, c. 56, § 1; 64 Del. Laws, c. 317, § 1; 64 Del. Laws, c. 325, §§ 2-4; 64 Del. Laws, c. 376, §§ 1, 2; 65 Del. Laws, c. 204, §§ 1-4; 65 Del. Laws, c. 394, §§ 1-4; 66 Del. Laws, c. 86, §§ 1, 2; 67 Del. Laws, c. 407, § 1; 68 Del. Laws, c. 82, § 1; 70 Del. Laws, c. 117, §§ 1, 2; 70 Del. Laws, c. 454, §§ 1-3; 70 Del. Laws, c. 455, § 1; 71 Del. Laws, c. 347, §§ 1, 2; 71 Del. Laws, c. 350, § 1; 72 Del. Laws, 1st Sp. Sess., c. 242,, § 1; 72 Del. Laws, 1st Sp. Sess., c. 248,, §§ 1, 2; 77 Del. Laws, c. 77, §§ 1, 2; 77 Del. Laws, c. 77, §§ 1, 2, 4; 78 Del. Laws, c. 74, §§ 1-3; 79 Del. Laws, c. 10, § 1