Recalculate

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input values
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• input fields allow entering simple formulas using arithmetical espressions
• example of a valid input: (1+2*2)/3
• most of the input values can be "tuned": hover mouse over and scroll up/down with Shift pressed
• when pointed with a mouse - tooltip for the input values will display the field's variable name (used in other formulas)

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output values
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• output values - calculated automatically from input values
• calculated fields are disabled for manual input
• when pointed with a mouse - tooltip for the field will show the field's variable name and calculation formula

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Payments Schedule
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• Shows monthly payments plan according to the loan parameters
• total_payment = base_payment + extra_payment + extra_payment2 + penalty
• base_payment = capital_payment + interest_amt (capital and interest payment values depend on the mortgage type)
• extra_payment - additional montlhy repayments, topped up so that total_payment >= extra_payment_topup
• extra_payment2 - additional periodic repayments
• extra_payment values can be manually adjusted by clicking on the value in the payment schedule cell. Adjusted values "live" until any other parameters of the loan gets changed and loan gets recalculated.

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house price
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• sell price of the house
• for "home ownership tax" (eigenwoningforfait) and for assets calculation - house value is used

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Tax refund target
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• For Annuity and Linear types of mortgages - a portion of interest payed is tax deductible(hypotheekrenteaftrek)
• tax refund target setting controls what happens to the tax benefit generated therefrom
• 0 - tax benefit is ignored as if it is not happening
• 1 - tax benefit is accrued as a "bonus" amount and summed up in "total tax refunded"
• 2 - tax benefit is used as an extra repayment towards principal debt (added to extra_payment)

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"net" amounts
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• if tax refund target = 1 "net" values calculated by substracting tax benefits (hypotheekrenteaftrek) from "gross" amounts

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Extra repayments
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• There are several repayments that can be modelled:
• [Mortgage] tab
• Monthly repayment
• Flexible periodic repayment: you can set period of the repayment (usually 12 months), first month of the repayment and repayment value
• [Extra repayments] tab
• 2 additional flexible periodic repayments
• extra_payment_topup: every month an extra repayment will be made such that total payment is not less than this value
• Settings
• Max. allowed yearly repayment sum - % from the original debt
• If total annual extra repayments amount surpass the max allowed threshold - surplus will be "taxed" by penalty %, and actual repayments made will be lower
• If penalty % is set to 100 - all extra repayments will be capped in such a way that no penalties occur

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Asset dynamics
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• Final (up to the loan's term) assets status calculated for two scenarios:
• Renting: monthly increment = salary - rent + yeary bonus (if the month is right), deposit rate is assumed for all current assets accumulated
• Housing: montlhy increment = salary - house ownership tax - loan payment (net) + yeary bonus (if the month is right), deposit rate assumed for all current assets accumulated, housing market rate assumed for the current estate (fraction) owned
• Comparisons
• Housing / Renting - ratio of final assets for aforementioned scenario
• Housing ROI = final housing assets / total amount of money invested in the mortgage

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Whatif analysis
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• It is a mechanism to model parameters of the loan as a function of any other parameter
• Any parameter of the loan can be "tested"
• "Variable1" / "Variable2": range descriptors for variables you'd like to "test". Format: variable_name(start_value, end_value, steps)
• "Metrics" comma-separated list of expressions (using loan parameter names), - result of which you'd like to see on the plot. In a simpliest case - it is just a parameter name of interest (e.g. loan_term_actual)
• If only Variable1 is specified - all metrics will be plotted on the 2-D.
• If both Variable1 and Variable2 specified - first metric in the list will be plotted on the 3-D plot(surface)."
• Probing takes time (depend on the number of steps requested), probing launched by [Recalculate] button.

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Interest rates
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• Overview
• ABN Amro
• ING
• Rabo Bank