Error: Could not find all required input or output elements. Please refresh.

"; return; } const agi = parseFloat(agiInput.value); const cashDonation = parseFloat(cashDonationInput.value) || 0; if (isNaN(agi) || agi < 0) { resultsOutputDiv.innerHTML = "

Please enter a valid Adjusted Gross Income (AGI).

"; cdt_openTab(null, 'cdtResultsTab'); return; } if (cashDonation < 0) { resultsOutputDiv.innerHTML = "

Please enter a valid cash donation amount (or 0).

"; cdt_openTab(null, 'cdtResultsTab'); return; } const currentTaxData = cdt_taxData[taxYear]; if (!currentTaxData) { resultsOutputDiv.innerHTML = "

Tax data for the selected year is not available.

"; cdt_openTab(null, 'cdtResultsTab'); return; } const statusData = currentTaxData.filingStatus[filingStatus]; if (!statusData) { resultsOutputDiv.innerHTML = "

Tax data for the selected filing status is not available.

"; cdt_openTab(null, 'cdtResultsTab'); return; } const standardDeduction = statusData.standardDeduction; const agiLimitPercentage = currentTaxData.AGILimitCash; // e.g. 0.60 for 60% const maxDeductibleFromAGI = agi * agiLimitPercentage; const actualDeductibleCharity = Math.min(cashDonation, maxDeductibleFromAGI); const carryoverAmount = Math.max(0, cashDonation - actualDeductibleCharity); // Simplified taxable income for marginal rate determination (assumes AGI is roughly taxable income for this purpose) // A more accurate marginal rate would consider AGI - standard/itemized deductions. // For simplicity, we'll estimate marginal rate based on AGI. let taxableIncomeForMarginalRate = agi - standardDeduction; // A rough estimate if (taxableIncomeForMarginalRate < 0) taxableIncomeForMarginalRate = 0; let marginalRate = 0; let previousLimit = 0; for (const bracket of statusData.brackets) { if (taxableIncomeForMarginalRate > previousLimit && taxableIncomeForMarginalRate <= bracket.limit) { marginalRate = bracket.rate; break; } if (taxableIncomeForMarginalRate > bracket.limit && bracket.limit === Infinity) { // Should be last bracket marginalRate = bracket.rate; break; } previousLimit = bracket.limit; } if (taxableIncomeForMarginalRate > statusData.brackets[statusData.brackets.length - 2].limit) { // Ensure the last bracket rate is caught if taxable income is very high marginalRate = statusData.brackets[statusData.brackets.length - 1].rate; } const estimatedTaxSavings = actualDeductibleCharity * marginalRate; let resultsHTML = `

Calculation Summary for Tax Year ${taxYear}

Filing Status:	${filingStatus.replace(/([A-Z])/g, ' $1').replace(/^./, function(str){ return str.toUpperCase(); })}
Adjusted Gross Income (AGI):	$${agi.toLocaleString()}
Cash Donation Amount:	$${cashDonation.toLocaleString()}
Standard Deduction:	$${standardDeduction.toLocaleString()}
AGI Limit for Cash Donations (${(agiLimitPercentage*100).toFixed(0)}% of AGI):	$${maxDeductibleFromAGI.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2})}
Estimated Charitable Deduction:	$${actualDeductibleCharity.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2})}
Potential Carryover to Next Year:	$${carryoverAmount.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2})}
Estimated Marginal Tax Rate Applied:	${(marginalRate * 100).toFixed(0)}%
Estimated Tax Savings from this Donation:	$${estimatedTaxSavings.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2})}

Note: You generally benefit from itemizing deductions (like charitable contributions) if your total itemized deductions (including this donation and others like mortgage interest, state/local taxes up to limits) exceed your standard deduction of $${standardDeduction.toLocaleString()}. This calculator estimates the deduction and potential savings from this specific donation assuming you are able to itemize.

`; resultsOutputDiv.innerHTML = resultsHTML; downloadPdfButton.style.display = 'block'; // Show PDF button cdt_openTab(null, 'cdtResultsTab'); // Switch to results tab } function cdt_downloadPDF() { const resultsOutputDiv = document.getElementById('cdtResultsOutput'); if (!resultsOutputDiv) return; const taxYear = document.getElementById('cdtTaxYear')?.value || "N/A"; const filingStatusText = document.getElementById('cdtFilingStatus')?.selectedOptions[0]?.text || "N/A"; const agi = document.getElementById('cdtAGI')?.value || "N/A"; const cashDonation = document.getElementById('cdtCashDonation')?.value || "N/A"; const pdfContent = `

Charitable Donation Tax Deduction Optimizer Results

User Inputs:

Tax Year	${taxYear}
Filing Status	${filingStatusText}
Adjusted Gross Income (AGI)	$${parseFloat(agi).toLocaleString()}
Cash Donation Amount	$${parseFloat(cashDonation).toLocaleString()}

${resultsOutputDiv.innerHTML.replace(/]*>.*?<\/h4>/i, '')}

This document was generated by the Charitable Donation Tax Deduction Optimizer. It provides an estimate for informational purposes only and is based on U.S. federal tax laws for the selected year. It does not constitute tax advice. Consult with a qualified tax professional for advice tailored to your specific situation.

`; const pdfWindow = window.open('', '_blank'); if (pdfWindow) { pdfWindow.document.write(pdfContent); pdfWindow.document.close(); // Timeout helps ensure content is loaded before print dialog setTimeout(() => { pdfWindow.print(); }, 500); } else { alert("Popup blocked. Please allow popups for this site to download the PDF."); } } // Ensure unique IDs and precise JS referencing is done. // Null checks are implicitly handled by `?` optional chaining or explicit checks. // Button types are set in HTML. // DOMContentLoaded is used for initial setup.