src/fed2019/Form1040.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 { Line, AccumulatorLine, ComputedLine, ReferenceLine, sumLineOfForms } from '../core/Line';
   8 import { UnsupportedFeatureError } from '../core/Errors';
   9 import { clampToZero, reduceBySum } from '../core/Math';
  10
  11 import Form8606 from './Form8606';
  12 import Form8959 from './Form8959';
  13 import Form1099INT from './Form1099INT';
  14 import Form1099DIV from './Form1099DIV';
  15 import Form1099R, { Box7Code } from './Form1099R';
  16 import W2 from './W2';
  17 import Schedule1 from './Schedule1';
  18 import Schedule2 from './Schedule2';
  19 import Schedule3 from './Schedule3';
  20 import ScheduleD, { ScheduleDTaxWorksheet } from './ScheduleD';
  21
  22 export enum FilingStatus {
  23   Single = 'S',
  24   MarriedFilingSeparate = 'MFS',
  25   MarriedFilingJoint = 'MFJ',
  26 };
  27
  28 export interface Form1040Input {
  29   filingStatus: FilingStatus;
  30 };
  31
  32 export default class Form1040 extends Form<Form1040['_lines'], Form1040Input> {
  33   readonly name = '1040';
  34
  35   protected readonly _lines = {
  36     '1': new AccumulatorLine(W2, '1', 'Wages, salaries, tips, etc.'),
  37     '2a': new ComputedLine((tr): number => {
  38       const value = (new AccumulatorLine(Form1099INT, '8')).value(tr) +
  39                     (new AccumulatorLine(Form1099DIV, '11')).value(tr);
  40       return value;
  41     }, 'Tax-exempt interest'),
  42     '2b': new AccumulatorLine(Form1099INT, '1', 'Taxable interest'),
  43     '3a': new AccumulatorLine(Form1099DIV, '1b', 'Qualified dividends'),
  44     '3b': new AccumulatorLine(Form1099DIV, '1a', 'Ordinary dividends'),
  45     '4a': new ComputedLine((tr): number => {
  46       const f1099Rs = tr.findForms(Form1099R).filter(f => !f.getValue(tr, '7').includes(Box7Code.G));
  47       return sumLineOfForms(tr, f1099Rs, '1');
  48     }),
  49     '4b': new ComputedLine((tr): number => {
  50       const f8606s = tr.findForms(Form8606);
  51       return sumLineOfForms(tr, f8606s, '15c') + sumLineOfForms(tr, f8606s, '18');
  52     }, 'IRA distributions, taxadble amount'),
  53     '4d': new ComputedLine(() => 0),
  54     // 4c and 4d are not supported
  55     // 5a and 5b are not supported
  56     '6': new ComputedLine((tr): number => {
  57       const schedD = tr.findForm(ScheduleD);
  58       if (!schedD)
  59         return 0;
  60
  61       const l6 = schedD.getValue(tr, '16');
  62       if (l6 >= 0)
  63         return l6;
  64       return schedD.getValue(tr, '21');
  65     }, 'Capital gain/loss'),
  66     '7a': new ReferenceLine(Schedule1, '9', 'Other income from Schedule 1', 0),
  67
  68     '7b': new ComputedLine((tr): number => {
  69       let income = 0;
  70       income += this.getValue(tr, '1');
  71       income += this.getValue(tr, '2b');
  72       income += this.getValue(tr, '3b');
  73       income += this.getValue(tr, '4b');
  74       income += this.getValue(tr, '4d');
  75       //income += this.getValue(tr, '5b');
  76       income += this.getValue(tr, '6');
  77       income += this.getValue(tr, '7a');
  78       return income;
  79     }, 'Total income'),
  80
  81     '8a': new ReferenceLine(Schedule1, '22', 'Adjustments to income', 0),
  82
  83     '8b': new ComputedLine((tr): number => {
  84       return this.getValue(tr, '7b') - this.getValue(tr, '8a');
  85     }, 'Adjusted gross income'),
  86
  87     '9': new ComputedLine((): number => {
  88       // TODO - Itemized deductions.
  89       switch (this.filingStatus) {
  90         case FilingStatus.Single:
  91         case FilingStatus.MarriedFilingSeparate:
  92           return 12200;
  93         case FilingStatus.MarriedFilingJoint:
  94           return 24400;
  95       }
  96     }, 'Deduction'),
  97
  98     '10': new ComputedLine((tr): number => {
  99       const taxableIncome = this.getValue(tr, '8b');
 100       let use8995a = false;
 101       switch (this.filingStatus) {
 102         case FilingStatus.Single:                use8995a = taxableIncome <= 160700; break;
 103         case FilingStatus.MarriedFilingSeparate: use8995a = taxableIncome <= 160725; break;
 104         case FilingStatus.MarriedFilingJoint:    use8995a = taxableIncome <= 321400; break;
 105       };
 106       return 0;
 107     }, 'Qualified business income deduction'),
 108
 109     '11a': new ComputedLine((tr): number => {
 110       return this.getValue(tr, '9') + this.getValue(tr, '10');
 111     }),
 112     '11b': new ComputedLine((tr): number => {
 113       return clampToZero(this.getValue(tr, '8b') - this.getValue(tr, '11a'));
 114     }, 'Taxable income'),
 115
 116     '12a': new ComputedLine((tr): number => {
 117       // Not supported:
 118       // Form 8814 (election to report child's interest or dividends)
 119       // Form 4972 (relating to lump-sum distributions)
 120
 121       const schedD = tr.findForm(ScheduleD);
 122       // Line 18 and 19 are not undefined or 0.
 123       if (schedD && !schedD.getValue(tr, '20')) {
 124         // Use ScheD tax worksheet;
 125         const schedDtw = tr.findForm(ScheduleDTaxWorksheet);
 126         if (schedDtw)
 127           return schedDtw.getValue(tr, '47');
 128       }
 129
 130       // If there are qualified dividends, use the QDCGTW.
 131       if (this.getValue(tr, '3a') > 0) {
 132         const qdcgtw = tr.getForm(QDCGTaxWorksheet);
 133         return qdcgtw.getValue(tr, '27');
 134       }
 135
 136       // Otherwise, compute just on taxable income.
 137       return computeTax(this.getValue(tr, '11b'), this.filingStatus);
 138     }, 'Tax'),
 139
 140     '12b': new ComputedLine((tr): number => {
 141       return this.getValue(tr, '12a') + tr.getForm(Schedule2).getValue(tr, '3');
 142     }, 'Additional tax'),
 143
 144     // Not supported: 13a - child tax credit
 145
 146     '13b': new ReferenceLine(Schedule3, '7', 'Additional credits', 0),
 147
 148     '14': new ComputedLine((tr): number => {
 149       return clampToZero(this.getValue(tr, '12b') - this.getValue(tr, '13b'));
 150     }),
 151
 152     '15': new ReferenceLine(Schedule2, '10', undefined, 0),
 153
 154     '16': new ComputedLine((tr): number => {
 155       return this.getValue(tr, '14') + this.getValue(tr, '15');
 156     }, 'Total tax'),
 157
 158     '17': new ComputedLine((tr): number => {
 159       const fedTaxWithheldBoxes = [
 160         new AccumulatorLine(W2, '2'),
 161         new AccumulatorLine(Form1099R, '4'),
 162         new AccumulatorLine(Form1099DIV, '4'),
 163         new AccumulatorLine(Form1099INT, '4'),
 164       ];
 165       const withholding: number[] = fedTaxWithheldBoxes.map(b => b.value(tr));
 166
 167       let additionalMedicare = 0;
 168       const f8959 = tr.findForm(Form8959)
 169       if (f8959) {
 170         additionalMedicare = f8959.getValue(tr, '24');
 171       }
 172
 173       return reduceBySum(withholding) + additionalMedicare;
 174     }, 'Federal income tax withheld'),
 175
 176     // 18a not supported - Earned income credit (EIC)
 177     // 18b not supported - Additional child tax credit. Attach Schedule 8812
 178     // 18c not supported - American opportunity credit from Form 8863, line 8
 179     '18d': new ReferenceLine(Schedule3, '14', undefined, 0),
 180     '18e': new ComputedLine((tr): number => {
 181       // Should include 18a-18c.
 182       return this.getValue(tr, '18d');
 183     }),
 184
 185     '19': new ComputedLine((tr): number => {
 186       return this.getValue(tr, '17') + this.getValue(tr, '18e');
 187     }, 'Total payments'),
 188
 189     '20': new ComputedLine((tr): number => {
 190       return clampToZero(this.getValue(tr, '19') - this.getValue(tr, '16'));
 191     }, 'Amount overpaid'),
 192
 193     '23': new ComputedLine((tr): number => {
 194       return clampToZero(this.getValue(tr, '16') - this.getValue(tr, '19'));
 195     }, 'Amount you owe'),
 196   }
 197
 198   get filingStatus(): FilingStatus {
 199     return this.getInput('filingStatus');
 200   }
 201 };
 202
 203 export function computeTax(income: number, filingStatus: FilingStatus): number {
 204   // From https://www.irs.gov/pub/irs-drop/rp-18-57.pdf, Section 3.01 and
 205   // https://www.irs.gov/pub/irs-pdf/p17.pdf, 2019 Tax Rate Schedules (p254).
 206   const taxBrackets = {
 207     // Format is:
 208     // [ limit-of-taxable-income, marginal-rate, base-tax ]
 209     // If Income is over Row[0], pay Row[2] + (Row[1] * (Income - PreviousRow[0]))
 210     [FilingStatus.MarriedFilingJoint]: [
 211       [ 19400, 0.10, 0 ],
 212       [ 78950, 0.12, 1940 ],
 213       [ 168400, 0.22, 9086 ],
 214       [ 321450, 0.24, 28765 ],
 215       [ 408200, 0.32, 65497 ],
 216       [ 612350, 0.35, 93257 ],
 217       [ Infinity, 0.37, 164709.50 ]
 218     ],
 219     [FilingStatus.Single]: [
 220       [ 9700, 0.10, 0 ],
 221       [ 39475, 0.12, 970 ],
 222       [ 84200, 0.22, 4543 ],
 223       [ 160725, 0.24, 14382.50 ],
 224       [ 204100, 0.32, 32748.50 ],
 225       [ 510300, 0.35, 46628.50 ],
 226       [ Infinity, 0.37, 153798.50 ]
 227     ],
 228     [FilingStatus.MarriedFilingSeparate]: [
 229       [ 9700, 0.10, 0 ],
 230       [ 39475, 0.12, 970 ],
 231       [ 84200, 0.22, 4543 ],
 232       [ 160725, 0.24, 14382.50 ],
 233       [ 204100, 0.32, 32748.50 ],
 234       [ 306175, 0.35, 46628.50 ],
 235       [ Infinity, 0.37, 82354.75 ]
 236     ]
 237   }[filingStatus];
 238
 239   let i = 0;
 240   while (taxBrackets[i][0] < income)
 241     ++i;
 242
 243   const bracket = taxBrackets[i];
 244   const bracketStart = i == 0 ? 0 : taxBrackets[i - 1][0];
 245
 246   return ((income - bracketStart) * bracket[1]) + bracket[2];
 247 };
 248
 249 export class QDCGTaxWorksheet extends Form<QDCGTaxWorksheet['_lines']> {
 250   readonly name = 'Qual Div Cap Gain Tax Worksheet';
 251
 252   protected readonly _lines = {
 253     '1': new ReferenceLine(Form1040, '11b', 'Taxable income'),
 254     '2': new ReferenceLine(Form1040, '3a', 'Qualified dividends'),
 255     '3': new ComputedLine((tr): number => {
 256       const schedD = tr.findForm(ScheduleD);
 257       if (schedD)
 258         return Math.min(schedD.getValue(tr, '15'), schedD.getValue(tr, '16'));
 259       return tr.getForm(Form1040).getValue(tr, '6');
 260     }),
 261     '4': new ComputedLine((tr): number => this.getValue(tr, '2') + this.getValue(tr, '3')),
 262     '5': new ComputedLine(() => 0), // Not supported - Form 4952/4g (nvestment interest expense deduction)
 263     '6': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '4') - this.getValue(tr, '5'))),
 264     '7': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '1') - this.getValue(tr, '6'))),
 265     '8': new ComputedLine((tr): number => {
 266       switch (tr.getForm(Form1040).filingStatus) {
 267         case FilingStatus.Single:
 268         case FilingStatus.MarriedFilingSeparate:
 269           return 39375;
 270         case FilingStatus.MarriedFilingJoint:
 271           return 78750;
 272       };
 273     }),
 274     '9': new ComputedLine((tr): number => Math.min(this.getValue(tr, '1'), this.getValue(tr, '8'))),
 275     '10': new ComputedLine((tr): number => Math.min(this.getValue(tr, '7'), this.getValue(tr, '9'))),
 276     '11': new ComputedLine((tr): number => {
 277       return this.getValue(tr, '9') - this.getValue(tr, '10');
 278     }, 'Amount taxed at 0%'),
 279     '12': new ComputedLine((tr): number => Math.min(this.getValue(tr, '1'), this.getValue(tr, '6'))),
 280     '13': new ReferenceLine(QDCGTaxWorksheet as any, '11'),
 281     '14': new ComputedLine((tr): number => this.getValue(tr, '12') - this.getValue(tr, '13')),
 282     '15': new ComputedLine((tr): number => {
 283       switch (tr.getForm(Form1040).filingStatus) {
 284         case FilingStatus.Single:                return 434550;
 285         case FilingStatus.MarriedFilingSeparate: return 244425;
 286         case FilingStatus.MarriedFilingJoint:    return 488850;
 287       };
 288     }),
 289     '16': new ComputedLine((tr): number => Math.min(this.getValue(tr, '1'), this.getValue(tr, '15'))),
 290     '17': new ComputedLine((tr): number => this.getValue(tr, '7') + this.getValue(tr, '11')),
 291     '18': new ComputedLine((tr): number => clampToZero(this.getValue(tr, '16') - this.getValue(tr, '17'))),
 292     '19': new ComputedLine((tr): number => Math.min(this.getValue(tr, '14'), this.getValue(tr, '18'))),
 293     '20': new ComputedLine((tr): number => {
 294       return this.getValue(tr, '19') * 0.15;
 295     }, 'Amount taxed at 15%'),
 296     '21': new ComputedLine((tr): number => this.getValue(tr, '11') + this.getValue(tr, '19')),
 297     '22': new ComputedLine((tr): number => this.getValue(tr, '12') - this.getValue(tr, '21')),
 298     '23': new ComputedLine((tr): number => {
 299       return this.getValue(tr, '22') * 0.20;
 300     }, 'Amount taxed at 20%'),
 301     '24': new ComputedLine((tr): number => {
 302       return computeTax(this.getValue(tr, '7'), tr.getForm(Form1040).filingStatus);
 303     }, 'Tax on line 7'),
 304     '25': new ComputedLine((tr): number => {
 305       return this.getValue(tr, '20') +
 306              this.getValue(tr, '23') +
 307              this.getValue(tr, '24');
 308     }),
 309     '26': new ComputedLine((tr): number => {
 310       return computeTax(this.getValue(tr, '1'), tr.getForm(Form1040).filingStatus);
 311     }, 'Tax on line 1'),
 312     '27': new ComputedLine((tr): number => {
 313       return Math.min(this.getValue(tr, '25'), this.getValue(tr, '26'));
 314     }, 'Tax on all taxable income')
 315   };
 316 };