src/fed2019/Form6251.ts

   1 // Copyright 2020 Blue Static <https://www.bluestatic.org>
   2 // This program is free software licensed under the GNU General Public License,
   3 // version 3.0. The full text of the license can be found in LICENSE.txt.
   4 // SPDX-License-Identifier: GPL-3.0-only
   5
   6 import { Form, TaxReturn } from '../core';
   7 import { AccumulatorLine, ComputedLine, InputLine, ReferenceLine, UnsupportedLine, sumFormLines } from '../core/Line';
   8 import { Literal, clampToZero } from '../core/Math';
   9
  10 import Form1040, { QDCGTaxWorksheet, FilingStatus } from './Form1040';
  11 import Form1099INT from './Form1099INT';
  12 import Schedule1 from './Schedule1';
  13 import Schedule2 from './Schedule2';
  14 import Schedule3 from './Schedule3';
  15 import ScheduleD, { ScheduleDTaxWorksheet } from './ScheduleD';
  16
  17 export interface Form6251Input {
  18   exerciseOfIncentiveStockOptions?: number;
  19   dispositionOfProperty?: number;
  20 }
  21
  22 class Input<T extends keyof Form6251Input> extends InputLine<Form6251Input, T> {}
  23
  24 export default class Form6251 extends Form<Form6251Input> {
  25   readonly name = '6251';
  26
  27   readonly lines = {
  28     // Part I
  29     '1': new ComputedLine((tr): number => {
  30       const f1040 = tr.getForm(Form1040);
  31       const income = f1040.taxableIncome(tr);
  32       if (income > 0)
  33         return income;
  34       return f1040.adjustedGrossIncome(tr) - f1040.deduction(tr) - f1040.qualifiedBusinessIncomeDeduction(tr);
  35     }, 'Regular taxable income'),
  36     '2a': new ComputedLine((tr): number => {
  37       // Not supported: Schedule A, line 7.
  38       return tr.getForm(Form1040).deduction(tr);
  39     }, 'Deduction'),
  40     '2b': new ReferenceLine(Schedule1, '1', 'Tax refund', 0),  // Not supported - line 8 SALT.
  41     '2c': new UnsupportedLine('Investment interest expense'),
  42     '2d': new UnsupportedLine('Depletion'),
  43     '2e': new UnsupportedLine('Net operating loss deduction'),
  44     '2f': new UnsupportedLine('Alternative tax net operating loss deduction'),
  45     '2g': new AccumulatorLine(Form1099INT, '9', 'Interest from specified private activity bonds exempt from the regular tax'),
  46     '2h': new UnsupportedLine('Qualified small business stock'),
  47     '2i': new Input('exerciseOfIncentiveStockOptions', 'Exercise of incentive stock options', 0),
  48     '2j': new UnsupportedLine('Estates and trusts (amount from Schedule K-1 (Form 1041), box 12, code A)'),
  49     '2k': new Input('dispositionOfProperty', 'Disposition of property', 0),
  50     '2l': new UnsupportedLine('Depreciation on assets placed in service after 1986'),
  51     '2m': new UnsupportedLine('Passive activities'),
  52     '2n': new UnsupportedLine('Loss limitations'),
  53     '2o': new UnsupportedLine('Circulation costs'),
  54     '2p': new UnsupportedLine('Long-term contracts'),
  55     '2q': new UnsupportedLine('Mining costs'),
  56     '2r': new UnsupportedLine('Research and experimental costs'),
  57     '2s': new UnsupportedLine('Income from certain installment sales before January 1, 1987'),
  58     '2t': new UnsupportedLine('Intangible drilling costs preference'),
  59     '3': new UnsupportedLine('Other adjustments'),
  60     '4': new ComputedLine((tr): number => {
  61       return sumFormLines(tr, this, ['1', '2a', '2b', '2c', '2d', '2e', '2f', '2g', '2h', '2i', '2j', '2k', '2l', '2m', '2n', '2o', '2p', '2q', '2r', '2s', '2t', '3']);
  62     }, 'Alternative minimum taxable income'),
  63
  64     // Part II
  65     '5': new ComputedLine((tr): number => {
  66       const fs = tr.getForm(Form1040).filingStatus;
  67       const exemption = tr.constants.amt.exemption[fs];
  68       const phaseout = tr.constants.amt.phaseout[fs];
  69
  70       const l4 = this.getValue(tr, '4');
  71       if (l4 < phaseout)
  72         return exemption;
  73
  74       // Exemption worksheet:
  75       const wl1 = exemption;
  76       const wl2 = l4;
  77       const wl3 = phaseout;
  78       const wl4 = clampToZero(wl2 - wl3);
  79       const wl5 = wl4 * Literal(0.25);
  80       const wl6 = clampToZero(wl1 - wl5);
  81       return wl6;
  82     }, 'Exemption'),
  83     '6': new ComputedLine((tr): number => {
  84       return clampToZero(this.getValue(tr, '4') - this.getValue(tr, '5'));
  85     }, 'AMT taxable income less exemption'),
  86     '7': new ComputedLine((tr): number => {
  87       // Not supported - Form 2555.
  88       // Not supported - Form1040 directly reporting cap gains on line 6.
  89
  90       const f1040 = tr.getForm(Form1040);
  91
  92       let part3 = f1040.qualifiedDividends(tr) > 0;
  93
  94       const schedD = tr.findForm(ScheduleD);
  95       if (schedD) {
  96         const flag = schedD.getValue(tr, '15') > 0 && schedD.getValue(tr, '16') > 0;
  97         part3 = part3 || flag;
  98       }
  99
 100       if (part3)
 101         return this.getValue(tr, '40');
 102
 103       return computeAmtTax(tr, this.getValue(tr, '6'));
 104     }),
 105     '8': new ReferenceLine(Schedule3, '1', 'Alternative minimum tax foreign tax credit'),  // Not supported - AMT FTC recalculation
 106     '9': new ComputedLine((tr): number => {
 107       return this.getValue(tr, '7') - this.getValue(tr, '8');
 108     }, 'Tentative minimum tax'),
 109     '10': new ComputedLine((tr): number => {
 110       let value = tr.getForm(Form1040).tax(tr);
 111       const sched2 = tr.findForm(Schedule2);
 112       if (sched2) {
 113         value += sched2.getValue(tr, '2');
 114       }
 115       // Not supported - subtracting Schedule3@1 for the AMT FTC.
 116       return value;
 117     }, 'Regular tax, adjusted for AMT'),
 118     '11': new ComputedLine((tr): number => {
 119       return clampToZero(this.getValue(tr, '9') - this.getValue(tr, '10'));
 120     }, 'AMT'),
 121
 122     // Part III
 123     '12': new ReferenceLine(Form6251 as any, '6'),
 124     '13': new ComputedLine((tr): number => {
 125       const schedDTW = tr.findForm(ScheduleDTaxWorksheet);
 126       if (schedDTW)
 127         return schedDTW.getValue(tr, '13');
 128
 129       return tr.getForm(QDCGTaxWorksheet).dividendsAndCapitalGains(tr);
 130     }),
 131     '14': new ReferenceLine(ScheduleD, '19', undefined, 0),
 132     '15': new ComputedLine((tr): number => {
 133       const value = this.getValue(tr, '13') + this.getValue(tr, '14');
 134       const schedDTW = tr.findForm(ScheduleDTaxWorksheet);
 135       if (schedDTW)
 136         return Math.min(value, schedDTW.getValue(tr, '10'));
 137
 138       return value;
 139     }),
 140     '16': new ComputedLine((tr): number => Math.min(this.getValue(tr, '12'), this.getValue(tr, '15'))),
 141     '17': new ComputedLine((tr): number => this.getValue(tr, '12') - this.getValue(tr, '16')),
 142     '18': new ComputedLine((tr): number => computeAmtTax(tr, this.getValue(tr, '17'))),
 143     '19': new ComputedLine((tr): number => {
 144       const fs = tr.getForm(Form1040).filingStatus;
 145       return tr.constants.capitalGains.rate0MaxIncome[fs];
 146     }),
 147     '20': new ComputedLine((tr): number => {
 148       const schedDTW = tr.findForm(ScheduleDTaxWorksheet);
 149       if (schedDTW)
 150         return clampToZero(schedDTW.getValue(tr, '14'));
 151
 152       return clampToZero(tr.getForm(QDCGTaxWorksheet).taxableIncomeLessDividendsAndCapitalGains(tr));
 153     }),
 154     '21': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '19') - this.getValue(tr, '20'))),
 155     '22': new ComputedLine((tr): number => Math.min(this.getValue(tr, '12'), this.getValue(tr, '13'))),
 156     '23': new ComputedLine((tr): number => Math.min(this.getValue(tr, '21'), this.getValue(tr, '22'))),
 157     '24': new ComputedLine((tr): number => this.getValue(tr, '22') - this.getValue(tr, '23')),
 158     '25': new ComputedLine((tr): number => {
 159       const fs = tr.getForm(Form1040).filingStatus;
 160       return tr.constants.capitalGains.rate15MaxIncome[fs];
 161     }),
 162     '26': new ReferenceLine(Form6251 as any, '21'),
 163     '27': new ComputedLine((tr): number => {
 164       const schedDTW = tr.findForm(ScheduleDTaxWorksheet);
 165       if (schedDTW)
 166         return clampToZero(schedDTW.getValue(tr, '21'));
 167
 168       return clampToZero(tr.getForm(QDCGTaxWorksheet).taxableIncomeLessDividendsAndCapitalGains(tr));
 169     }),
 170     '28': new ComputedLine((tr): number => this.getValue(tr, '26') + this.getValue(tr, '27')),
 171     '29': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '25') - this.getValue(tr, '28'))),
 172     '30': new ComputedLine((tr): number => Math.min(this.getValue(tr, '24'), this.getValue(tr, '29'))),
 173     '31': new ComputedLine((tr): number => this.getValue(tr, '30') * 0.15),
 174     '32': new ComputedLine((tr): number => this.getValue(tr, '23') + this.getValue(tr, '30')),
 175     '33': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '22') - this.getValue(tr, '32'))),
 176     '34': new ComputedLine((tr): number => this.getValue(tr, '33') * 0.20),
 177     '35': new ComputedLine((tr): number => this.getValue(tr, '17') + this.getValue(tr, '32') + this.getValue(tr, '33')),
 178     '36': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '12') - this.getValue(tr, '35'))),
 179     '37': new ComputedLine((tr): number => this.getValue(tr, '36') * 0.25),
 180     '38': new ComputedLine((tr): number => sumFormLines(tr, this, ['18', '31', '34', '37'])),
 181     '39': new ComputedLine((tr): number => computeAmtTax(tr, this.getValue(tr, '12'))),
 182     '40': new ComputedLine((tr): number => Math.min(this.getValue(tr, '38'), this.getValue(tr, '39'))),
 183   };
 184 };
 185
 186 function computeAmtTax(tr: TaxReturn, amount) {
 187   const fs = tr.getForm(Form1040).filingStatus;
 188   const limit = tr.constants.amt.limitForRate28Percent[fs];
 189   const sub = limit * 0.02;  // Difference between the two rates.
 190
 191   if (amount < limit)
 192     return amount * Literal(0.26);
 193   return (amount * Literal(0.28)) - sub;
 194 }