feat: add Patentprozesskostenrechner fee calculation engine + API
Pure Go implementation of patent litigation cost calculator with: - Step-based GKG/RVG fee accumulator across 4 historical schedules (2005/2013/2021/2025 + Aktuell alias) - Instance multiplier tables for 8 court types (LG, OLG, BGH NZB/Rev, BPatG, BGH Null, DPMA, BPatG Canc) - Full attorney fee calculation (VG, TG, Erhöhungsgebühr Nr. 1008 VV RVG, Auslagenpauschale) - Prozesskostensicherheit computation - UPC fee data (pre-2026 and 2026 schedules with value-based brackets, recoverable costs ceilings) - Public API: POST /api/fees/calculate, GET /api/fees/schedules (no auth required) - 22 unit tests covering all calculation paths Fixes 3 Excel bugs: - Bug 1: Prozesskostensicherheit VAT formula (subtract → add) - Bug 2: Security for costs uses GKG base for court fee, not RVG - Bug 3: Expert fees included in BPatG instance total
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backend/internal/services/fee_data.go
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backend/internal/services/fee_data.go
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package services
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import "math"
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// feeBracket defines one bracket in the GKG/RVG fee schedule.
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// Each bracket covers a range of Streitwert values.
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type feeBracket struct {
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UpperBound float64 // upper bound of this bracket
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StepSize float64 // step size within this bracket
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GKGIncrement float64 // GKG fee increment per step
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RVGIncrement float64 // RVG fee increment per step
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}
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// feeScheduleData holds the bracket data for a fee schedule version.
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type feeScheduleData struct {
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Label string
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ValidFrom string
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Brackets []feeBracket
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AliasOf string // if non-empty, this schedule is an alias for another
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}
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// feeSchedules contains all historical GKG/RVG fee schedule versions.
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// Data extracted from Patentprozesskostenrechner.xlsm ListObjects.
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var feeSchedules = map[string]*feeScheduleData{
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"2005": {
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Label: "GKG/RVG 2006-09-01",
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ValidFrom: "2006-09-01",
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Brackets: []feeBracket{
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{300, 300, 25, 25},
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{1500, 300, 10, 20},
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{5000, 500, 8, 28},
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{10000, 1000, 15, 37},
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{25000, 3000, 23, 40},
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{50000, 5000, 29, 72},
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{200000, 15000, 100, 77},
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{500000, 30000, 150, 118},
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{math.MaxFloat64, 50000, 150, 150},
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},
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},
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"2013": {
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Label: "GKG/RVG 2013-08-01",
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ValidFrom: "2013-08-01",
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Brackets: []feeBracket{
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{500, 300, 35, 45},
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{2000, 500, 18, 35},
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{10000, 1000, 19, 51},
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{25000, 3000, 26, 46},
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{50000, 5000, 35, 75},
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{200000, 15000, 120, 85},
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{500000, 30000, 179, 120},
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{math.MaxFloat64, 50000, 180, 150},
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},
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},
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"2021": {
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Label: "GKG/RVG 2021-01-01",
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ValidFrom: "2021-01-01",
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Brackets: []feeBracket{
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{500, 300, 38, 49},
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{2000, 500, 20, 39},
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{10000, 1000, 21, 56},
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{25000, 3000, 29, 52},
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{50000, 5000, 38, 81},
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{200000, 15000, 132, 94},
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{500000, 30000, 198, 132},
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{math.MaxFloat64, 50000, 198, 165},
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},
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},
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"2025": {
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Label: "GKG/RVG 2025-06-01",
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ValidFrom: "2025-06-01",
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Brackets: []feeBracket{
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{500, 300, 40, 51.5},
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{2000, 500, 21, 41.5},
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{10000, 1000, 22.5, 59.5},
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{25000, 3000, 30.5, 55},
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{50000, 5000, 40.5, 86},
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{200000, 15000, 140, 99.5},
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{500000, 30000, 210, 140},
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{math.MaxFloat64, 50000, 210, 175},
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},
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},
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"Aktuell": {
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Label: "Aktuell (= 2025-06-01)",
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ValidFrom: "2025-06-01",
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AliasOf: "2025",
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},
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}
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// instanceConfig holds the multipliers and fee basis for each court instance.
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type instanceConfig struct {
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Label string
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CourtFactor float64 // multiplier for base court fee
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CourtSource string // "GKG", "PatKostG", or "fixed"
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FixedCourtFee float64 // only used when CourtSource is "fixed"
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RAVGFactor float64 // Rechtsanwalt Verfahrensgebühr factor
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RATGFactor float64 // Rechtsanwalt Terminsgebühr factor
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PAVGFactor float64 // Patentanwalt Verfahrensgebühr factor
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PATGFactor float64 // Patentanwalt Terminsgebühr factor
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HasPA bool // whether patent attorneys are applicable
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}
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// instanceConfigs defines the fee parameters for each court instance type.
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var instanceConfigs = map[string]instanceConfig{
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"LG": {"LG (Verletzung 1. Instanz)", 3.0, "GKG", 0, 1.3, 1.2, 1.3, 1.2, true},
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"OLG": {"OLG (Berufung)", 4.0, "GKG", 0, 1.6, 1.2, 1.6, 1.2, true},
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"BGH_NZB": {"BGH (Nichtzulassungsbeschwerde)", 2.0, "GKG", 0, 2.3, 1.2, 1.6, 1.2, true},
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"BGH_Rev": {"BGH (Revision)", 5.0, "GKG", 0, 2.3, 1.5, 1.6, 1.5, true},
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"BPatG": {"BPatG (Nichtigkeitsverfahren)", 4.5, "PatKostG", 0, 1.3, 1.2, 1.3, 1.2, true},
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"BGH_Null": {"BGH (Nichtigkeitsberufung)", 6.0, "GKG", 0, 1.6, 1.5, 1.6, 1.5, true},
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"DPMA": {"DPMA (Löschungsverfahren)", 0, "fixed", 300, 1.3, 1.2, 0, 0, false},
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"BPatG_Canc": {"BPatG (Löschungsbeschwerde)", 0, "fixed", 500, 1.3, 1.2, 0, 0, false},
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}
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// --- UPC Fee Data ---
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// upcFeeBracket defines one bracket in a UPC fee table.
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// MaxValue 0 means unlimited (last bracket).
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type upcFeeBracket struct {
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MaxValue float64
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Fee float64
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}
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type upcFixedFees struct {
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Infringement float64
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CounterclaimInfringement float64
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NonInfringement float64
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LicenseCompensation float64
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DetermineDamages float64
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RevocationStandalone float64
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CounterclaimRevocation float64
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ProvisionalMeasures float64
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}
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type upcScheduleData struct {
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Label string
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ValidFrom string
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FixedFees upcFixedFees
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ValueBased []upcFeeBracket
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Recoverable []upcFeeBracket
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SMReduction float64
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}
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// upcSchedules contains UPC fee data for pre-2026 and 2026+ schedules.
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var upcSchedules = map[string]*upcScheduleData{
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"pre2026": {
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Label: "UPC (vor 2026)",
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ValidFrom: "2023-06-01",
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FixedFees: upcFixedFees{
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Infringement: 11000,
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CounterclaimInfringement: 11000,
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NonInfringement: 11000,
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LicenseCompensation: 11000,
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DetermineDamages: 3000,
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RevocationStandalone: 20000,
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CounterclaimRevocation: 20000,
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ProvisionalMeasures: 11000,
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},
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ValueBased: []upcFeeBracket{
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{500000, 0},
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{750000, 2500},
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{1000000, 4000},
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{1500000, 8000},
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{2000000, 13000},
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{3000000, 20000},
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{4000000, 26000},
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{5000000, 32000},
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{6000000, 39000},
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{7000000, 46000},
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{8000000, 52000},
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{9000000, 58000},
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{10000000, 65000},
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{15000000, 75000},
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{20000000, 100000},
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{25000000, 125000},
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{30000000, 150000},
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{50000000, 250000},
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{0, 325000},
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},
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Recoverable: []upcFeeBracket{
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{250000, 38000},
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{500000, 56000},
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{1000000, 112000},
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{2000000, 200000},
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{4000000, 400000},
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{8000000, 600000},
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{16000000, 800000},
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{30000000, 1200000},
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{50000000, 1500000},
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{0, 2000000},
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},
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SMReduction: 0.40,
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},
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"2026": {
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Label: "UPC (ab 2026)",
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ValidFrom: "2026-01-01",
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FixedFees: upcFixedFees{
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Infringement: 14600,
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CounterclaimInfringement: 14600,
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NonInfringement: 14600,
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LicenseCompensation: 14600,
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DetermineDamages: 4000,
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RevocationStandalone: 26500,
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CounterclaimRevocation: 26500,
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ProvisionalMeasures: 14600,
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},
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// Estimated ~32% increase on pre-2026 values; replace with official data when available.
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ValueBased: []upcFeeBracket{
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{500000, 0},
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{750000, 3300},
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{1000000, 5300},
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{1500000, 10600},
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{2000000, 17200},
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{3000000, 26400},
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{4000000, 34300},
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{5000000, 42200},
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{6000000, 51500},
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{7000000, 60700},
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{8000000, 68600},
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{9000000, 76600},
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{10000000, 85800},
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{15000000, 99000},
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{20000000, 132000},
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{25000000, 165000},
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{30000000, 198000},
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{50000000, 330000},
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{0, 429000},
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},
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Recoverable: []upcFeeBracket{
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{250000, 38000},
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{500000, 56000},
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{1000000, 112000},
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{2000000, 200000},
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{4000000, 400000},
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{8000000, 600000},
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{16000000, 800000},
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{30000000, 1200000},
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{50000000, 1500000},
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{0, 2000000},
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},
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SMReduction: 0.50,
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},
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}
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// Fee calculation constants (RVG)
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const (
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erhoehungsfaktor = 0.3 // Nr. 1008 VV RVG increase per additional client
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erhoehungsfaktorMax = 2.0 // maximum increase factor
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auslagenpauschale = 20.0 // Nr. 7002 VV RVG flat expense allowance (EUR)
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)
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