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詳现ã¯ç®¡èœåºåã«ãã£ãŠå€§ããç°ãªããŸãããããã€ãã®äžè¬çãªæ¹æ³è«ãäžçäžã§çšéèšç®ãæ¯ããŠããŸããããããçè§£ããããšã¯ãã¢ã«ãŽãªãºã ããžãã¯ãçè§£ããã®ã«åœ¹ç«ã¡ãŸãã
1. å®ç課çš
æŠå¿µïŒåäžã®çšçããã¹ãŠã®èª²çšå¯Ÿè±¡æåŸã«é©çšãããŸããããã¯æåŸçšã§ã¯ããŸãäžè¬çã§ã¯ãããŸããããäžéšã®å°æ¹çšãŸãã¯ç¹å®ã®çš®é¡ã®æåŸã§èŠãããå ŽåããããŸãã
ã¢ã«ãŽãªãºã ããžãã¯ïŒç°¡ç¥åïŒïŒ
tax_amount = taxable_income * flat_tax_rate
äŸïŒç®¡èœåºåãç¹å®ã®çš®é¡ã®ããŒãã¹ã«5ïŒ ã®å®ççšã課ããããŒãã¹ã$1000ã®å Žåãçšéã¯$50ã§ãã
2. 环é²èª²çšïŒçšçåºåã·ã¹ãã ïŒ
æŠå¿µïŒæåŸãå¢å ããã«ã€ããŠãé£ç¶ããæåŸã®éšåã«é©çšãããçšçãå¢å ããŸããããã¯ãå€ãã®åœã§æåŸçšã®æãäžè¬çãªã·ã¹ãã ã§ãã
ã¢ã«ãŽãªãºã ããžãã¯ïŒæŠå¿µçïŒïŒ
ã¢ã«ãŽãªãºã ã¯ãå®çŸ©æžã¿ã®çšçåºåãå埩åŠçããŸããåºåããšã«ããã®åºåã«è©²åœããæåŸã®éšåã«å¯Ÿããçšéãèšç®ããŸãã
仮説çãªçšçåºåã䜿çšããç°¡ç¥åãããäŸãèããŠã¿ãŸãããã
- åºå1ïŒ$0ã$10,000 @ 10ïŒ
- åºå2ïŒ$10,001ã$40,000 @ 20ïŒ
- åºå3ïŒ$40,001ä»¥äž @ 30ïŒ
åŸæ¥å¡ã$35,000ã®èª²çšå¯Ÿè±¡æåŸãæã£ãŠããå ŽåïŒ
- åºå1ïŒ$10,000 * 10ïŒ = $1,000
- åºå2ïŒïŒ$35,000 - $10,000ïŒ* 20ïŒ = $25,000 * 20ïŒ = $5,000
- åèšçšéïŒ$1,000 + $5,000 = $6,000
ã¢ã«ãŽãªãºã ã¯ãæåŸå šäœãåºåã«è©²åœããããè€æ°ã®åºåã«ãŸããããããã§ãã¯ããªããããããã®èšç®ãäœç³»çã«å®è¡ããŸãã
3. æºæ³åŸŽåæåœãšå é€
æŠå¿µïŒåŸæ¥å¡ã¯ã課çšå¯Ÿè±¡ãšãªãæåŸãæžããæåœïŒæ¶é€å®¶æãªã©ã«åºã¥ãïŒãŸãã¯å é€ãè«æ±ã§ããããšãå€ããããã«ããæºæ³åŸŽåãããçšé¡ãæžå°ããŸããç±³åœã§ã¯ãããã¯å€ãã®å Žåãæåœãæå®ãããã©ãŒã W-4ãéããŠç®¡çãããŸããä»ã®åœã§ã¯ãåæ§ã®ã¡ã«ããºã ãååšããŸãã
ã¢ã«ãŽãªãºã ããžãã¯ïŒ
ã¢ã«ãŽãªãºã ã¯ãæåã«ç·èª²çšå¯Ÿè±¡æåŸã決å®ããŸããæ¬¡ã«ãçšçãé©çšããåã«ãæåœãŸãã¯å é€ã®å€ãå·®ãåŒããŸããæåœã®äŸ¡å€ã®èšç®èªäœã¯ãç¹å®ã®èŠåïŒããšãã°ãæåœããšã®åºå®é¡ããŸãã¯çµŠäžã®å²åïŒã«ãã£ãŠç®¡çãããããšããããããŸãã
allowance_value = employee_allowances * value_per_allowance
adjusted_taxable_income = taxable_income - allowance_value
tax_amount = calculate_tax_using_bracket_system(adjusted_taxable_income)
4. 瀟äŒä¿éããã³ãã®ä»ã®çŸ©åçãªæ åº
æŠå¿µïŒå€ãã®åœã«ã¯ãåŸæ¥å¡ãšéçšäž»ãæ åºãã矩åçãªç€ŸäŒä¿éå¶åºŠããããŸãããããã«ã¯ãç¹å®ã®æ åºçãæå€§æåŸãããå€ãããã³éçšäž»ãšåŸæ¥å¡ã§ç°ãªãçãããå ŽåããããŸãã
ã¢ã«ãŽãªãºã ããžãã¯ïŒ
ã¢ã«ãŽãªãºã ã¯ã以äžã確èªããå¿ èŠããããŸãã
- åŸæ¥å¡ã®åå ¥ã瀟äŒä¿éè³éããŒã¹ïŒæ åºå¯Ÿè±¡ã®æå€§æåŸïŒãè¶ ããŠãããã©ããã
- åŸæ¥å¡ãšéçšäž»ã®æ£ããæ åºçã
- æºããããŠããå¹Žåæ¥ã®å¶éã
social_security_base = get_social_security_wage_base(year, country)
employee_ss_rate = get_employee_ss_rate(country)
taxable_for_ss = min(gross_earnings, social_security_base - ytd_ss_contributions)
employee_ss_contribution = taxable_for_ss * employee_ss_rate
5. çšé¡æ§é€
æŠå¿µïŒçšé¡æ§é€ã¯ãæ¯æãã¹ãçšé¡ããã«å¯Ÿãã«ïŒãŸãã¯åçã®é貚ïŒã§çŽæ¥åæžããŸãããããã¯ãåäŸããããæè²è²»ããŸãã¯ç¹å®ã®æè³ãªã©ã®ããŸããŸãªèŠå ã«åºã¥ããŠããå¯èœæ§ããããŸãã
ã¢ã«ãŽãªãºã ããžãã¯ïŒ
çšé¡æ§é€ã¯ãéåžžãçšçåºåã·ã¹ãã ã䜿çšããŠåæçšåäžã®çŸ©åãèšç®ããã*åŸ*ã«é©çšãããŸããã¢ã«ãŽãªãºã ã¯ãããŸããŸãªã¯ã¬ãžããã®è³æ Œã倿ãããããã®å€ãåèšããå¿ èŠããããŸãã
initial_tax_liability = calculate_tax_using_bracket_system(taxable_income_after_deductions)
total_tax_credits = sum_eligible_tax_credits(employee_data)
final_tax_owed = initial_tax_liability - total_tax_credits
6. çµã¿åãããšè€éãªèšç®
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- ç¬èªã®èŠåãæã€å°æ¹æåŸçšã
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ããã¯ãå®éã®çšéèšç®ãå®è¡ãããã³ã¢ã§ããããŸããŸãªçšã®çš®é¡ãšç®¡èœåºåã®ããžãã¯ãæ ŒçŽãããŠããŸããæ¬¡ã®ããã§ããå¿ èŠããããŸãã
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- ãã©ã¡ããªãã¯ïŒåºç¯ãªã³ãŒãã®æžãæããå¿ èŠãšããã«ãçšæ³ãšãã©ã¡ãŒã¿ãè¿ éã«æŽæ°ã§ããŸãã
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