accountant-expert

name	accountant-expert
version	1.0.0
description	Expert-level accounting, tax, financial reporting, and accounting systems
category	professional
tags	["accounting","tax","financial-reporting","gaap","ifrs"]
allowed-tools	["Read","Write","Edit"]

Accountant Expert

Expert guidance for accounting systems, financial reporting, tax compliance, and modern accounting technology.

Core Concepts

Accounting Principles

• GAAP (Generally Accepted Accounting Principles)
• IFRS (International Financial Reporting Standards)
• Double-entry bookkeeping
• Accrual vs cash accounting
• Financial statement preparation
• Audit and assurance

Financial Statements

• Balance sheet (Statement of Financial Position)
• Income statement (P&L)
• Cash flow statement
• Statement of changes in equity
• Notes to financial statements

Tax & Compliance

• Corporate tax planning
• VAT/Sales tax management
• Payroll tax compliance
• Tax filing and reporting
• Transfer pricing
• International taxation

Double-Entry Bookkeeping

from decimal import Decimal
from datetime import datetime
from enum import Enum
from typing import List

class AccountType(Enum):
    ASSET = "asset"
    LIABILITY = "liability"
    EQUITY = "equity"
    REVENUE = "revenue"
    EXPENSE = "expense"

class Account:
    def __init__(self, code: str, name: str, account_type: AccountType):
        self.code = code
        self.name = name
        self.type = account_type
        self.balance = Decimal('0')
        self.debit_total = Decimal('0')
        self.credit_total = Decimal('0')

    def is_debit_normal(self) -> bool:
        """Check if account has normal debit balance"""
        return self.type in [AccountType.ASSET, AccountType.EXPENSE]

class JournalEntry:
    def __init__(self, date: datetime, description: ):
        . = .generate_entry_id()
        .date = date
        .description = description
        .lines = []
        .posted = 

     ():
        
         debit  credit:
             ValueError()

        .lines.append({
            : account,
            : debit  Decimal(),
            : credit  Decimal()
        })

     () -> :
        
        total_debits = (line[]  line  .lines)
        total_credits = (line[]  line  .lines)

         total_debits == total_credits

     () -> :
        
          .validate():
             ValueError()

         line  .lines:
            account = line[]
             line[]:
                account.debit_total += line[]
             line[]:
                account.credit_total += line[]

            
             account.is_debit_normal():
                account.balance = account.debit_total - account.credit_total
            :
                account.balance = account.credit_total - account.debit_total

        .posted = 
         

Financial Statement Generation

class FinancialStatements:
    def __init__(self, company_name: str, period_end: datetime):
        self.company_name = company_name
        self.period_end = period_end
        self.accounts = []

    def generate_balance_sheet(self) -> dict:
        """Generate balance sheet"""
        assets = self.sum_accounts_by_type(AccountType.ASSET)
        liabilities = self.sum_accounts_by_type(AccountType.LIABILITY)
        equity = self.sum_accounts_by_type(AccountType.EQUITY)

        # Calculate retained earnings
        revenue = self.sum_accounts_by_type(AccountType.REVENUE)
        expenses = self.sum_accounts_by_type(AccountType.EXPENSE)
        net_income = revenue - expenses

        total_equity = equity + net_income

        return {
            "company": self.company_name,
            "period_end": self.period_end,
            "assets": {
                "current_assets": self.get_current_assets(),
                "non_current_assets": self.get_non_current_assets(),
                "total": assets
            },
            "liabilities": {
                "current_liabilities": self.get_current_liabilities(),
                "non_current_liabilities": self.get_non_current_liabilities(),
                "total": liabilities
            },
            : {
                : equity,
                : net_income,
                : total_equity
            },
            : assets == (liabilities + total_equity)
        }

     () -> :
        
        revenue = .sum_accounts_by_type(AccountType.REVENUE)
        expenses = .sum_accounts_by_type(AccountType.EXPENSE)

        gross_profit = revenue - .get_cogs()
        operating_expenses = .get_operating_expenses()
        operating_income = gross_profit - operating_expenses

        interest_expense = .get_interest_expense()
        tax_expense = .calculate_tax(operating_income - interest_expense)

        net_income = operating_income - interest_expense - tax_expense

         {
            : .company_name,
            : ,
            : revenue,
            : .get_cogs(),
            : gross_profit,
            : operating_expenses,
            : operating_income,
            : interest_expense,
            : tax_expense,
            : net_income,
            : .calculate_eps(net_income)
        }

     () -> :
        
         {
            : .calculate_operating_cash_flow(),
            : .calculate_investing_cash_flow(),
            : .calculate_financing_cash_flow(),
            : .calculate_net_cash_change(),
            : .get_beginning_cash(),
            : .get_ending_cash()
        }

Tax Calculations

class TaxCalculator:
    def calculate_corporate_tax(self, taxable_income: Decimal,
                                jurisdiction: str = "US") -> dict:
        """Calculate corporate income tax"""
        if jurisdiction == "US":
            tax_rate = Decimal('0.21')  # Federal rate
        elif jurisdiction == "UK":
            tax_rate = Decimal('0.19')
        else:
            tax_rate = Decimal('0.25')  # Default rate

        tax_amount = taxable_income * tax_rate

        return {
            "taxable_income": taxable_income,
            "tax_rate": tax_rate,
            "tax_amount": tax_amount.quantize(Decimal('0.01')),
            "effective_rate": tax_rate,
            "jurisdiction": jurisdiction
        }

    def calculate_vat(self, net_amount: Decimal, vat_rate: Decimal) -> dict:
        """Calculate VAT/Sales tax"""
        vat_amount = net_amount * vat_rate
        gross_amount = net_amount + vat_amount

        return {
            "net_amount": net_amount,
            "vat_rate": vat_rate,
            "vat_amount": vat_amount.quantize(Decimal('0.01')),
            "gross_amount": gross_amount.quantize(Decimal('0.01'))
        }

    def calculate_depreciation(self, cost: Decimal, salvage_value: Decimal,
                              useful_life_years: ,
                              method:  = ) -> []:
        
         method == :
            annual_depreciation = (cost - salvage_value) / useful_life_years

            schedule = []
            book_value = cost

             year  (, useful_life_years + ):
                depreciation = annual_depreciation
                book_value -= depreciation

                schedule.append({
                    : year,
                    : depreciation.quantize(Decimal()),
                    : (annual_depreciation * year).quantize(Decimal()),
                    : book_value.quantize(Decimal())
                })

             schedule

Financial Ratios

class FinancialRatios:
    @staticmethod
    def current_ratio(current_assets: Decimal, current_liabilities: Decimal) -> Decimal:
        """Liquidity ratio: Current Assets / Current Liabilities"""
        return (current_assets / current_liabilities).quantize(Decimal('0.01'))

    @staticmethod
    def quick_ratio(current_assets: Decimal, inventory: Decimal,
                    current_liabilities: Decimal) -> Decimal:
        """Acid test: (Current Assets - Inventory) / Current Liabilities"""
        return ((current_assets - inventory) / current_liabilities).quantize(Decimal('0.01'))

    @staticmethod
    def debt_to_equity(total_debt: Decimal, total_equity: Decimal) -> Decimal:
        """Leverage ratio: Total Debt / Total Equity"""
        return (total_debt / total_equity).quantize(Decimal('0.01'))

    @staticmethod
    def return_on_equity(net_income: Decimal, shareholders_equity: Decimal) -> Decimal:
        """ROE: Net Income / Shareholders' Equity"""
        return (net_income / shareholders_equity * 100).quantize(Decimal('0.01'))

    @staticmethod
    def return_on_assets(net_income: Decimal, total_assets: Decimal) -> Decimal:
        """ROA: Net Income / Total Assets"""
        return (net_income / total_assets * 100).quantize(Decimal('0.01'))


     () -> Decimal:
        
         (net_income / revenue * ).quantize(Decimal())

Best Practices

Accounting Systems

• Implement proper internal controls
• Segregation of duties
• Regular account reconciliations
• Maintain supporting documentation
• Use accounting software with audit trails
• Regular backups of financial data
• Year-end closing procedures

Financial Reporting

• Follow GAAP/IFRS standards
• Consistent accounting policies
• Clear disclosure of estimates
• Timely financial statement preparation
• Independent audit for larger entities
• Management discussion and analysis (MD&A)

Tax Compliance

• Maintain organized tax records
• Track deductible expenses properly
• Timely tax filing and payments
• Quarterly estimated tax payments
• Transfer pricing documentation
• Tax planning throughout the year

Anti-Patterns

❌ Using cash accounting for large businesses ❌ No account reconciliations ❌ Missing audit trails ❌ Inconsistent revenue recognition ❌ Inadequate internal controls ❌ Poor documentation of transactions ❌ Late tax filing and penalties

Resources

• FASB (Financial Accounting Standards Board): https://www.fasb.org/
• IFRS Foundation: https://www.ifrs.org/
• IRS Tax Information: https://www.irs.gov/
• AICPA (American Institute of CPAs): https://www.aicpa.org/