0001001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Income (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit) link:presentationLink link:calculationLink link:definitionLink 1006007 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 1007008 - Statement - Condensed Consolidated Statements of Cash Flows (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - Description of Business and Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - Description of Business and Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 2403401 - Disclosure - Description of Business and Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 2104102 - Disclosure - Revenue link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Revenue - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Revenue - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2408404 - Disclosure - Revenue - Loan Servicing Rights (Details) link:presentationLink link:calculationLink link:definitionLink 2409405 - Disclosure - Revenue - Fees Collected (Details) link:presentationLink link:calculationLink link:definitionLink 2410406 - Disclosure - Revenue - Interest Income and Fair Value Adjustments (Details) link:presentationLink link:calculationLink link:definitionLink 2111103 - Disclosure - Securitizations and Variable Interest Entities link:presentationLink link:calculationLink link:definitionLink 2312302 - Disclosure - Securitizations and Variable Interest Entities (Tables) link:presentationLink link:calculationLink link:definitionLink 2413407 - Disclosure - Securitizations and Variable Interest Entities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2414408 - Disclosure - Securitizations and Variable Interest Entities - Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2115104 - Disclosure - Fair Value Measurement link:presentationLink link:calculationLink link:definitionLink 2316303 - Disclosure - Fair Value Measurement (Tables) link:presentationLink link:calculationLink link:definitionLink 2417409 - Disclosure - Fair Value Measurement - Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2418410 - Disclosure - Fair Value Measurement - Loans Held (Details) link:presentationLink link:calculationLink link:definitionLink 2419411 - Disclosure - Fair Value Measurement - Measurement Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 2420412 - Disclosure - Fair Value Measurement - Sensitivity of Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2421413 - Disclosure - Fair Value Measurement - Loans Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 2422414 - Disclosure - Fair Value Measurement - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2423415 - Disclosure - Fair Value Measurement - Note Receivable Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 2424416 - Disclosure - Fair Value Measurement - Fair Value Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 2425417 - Disclosure - Fair Value Measurement - Loan Servicing Sensitivity (Details) link:presentationLink link:calculationLink link:definitionLink 2426418 - Disclosure - Fair Value Measurement - Loan Servicing Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 2427419 - Disclosure - Fair Value Measurement - Trailing Fee Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 2128105 - Disclosure - Loans at Fair Value link:presentationLink link:calculationLink link:definitionLink 2329304 - Disclosure - Loans at Fair Value (Tables) link:presentationLink link:calculationLink link:definitionLink 2430420 - Disclosure - Loans at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2131106 - Disclosure - Balance Sheet Components link:presentationLink link:calculationLink link:definitionLink 2332305 - Disclosure - Balance Sheet Components (Tables) link:presentationLink link:calculationLink link:definitionLink 2433421 - Disclosure - Balance Sheet Components - Other Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2434422 - Disclosure - Balance Sheet Components - Property Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 2435423 - Disclosure - Balance Sheet Components - Accrued Expenses and Other Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2136107 - Disclosure - Acquisitions link:presentationLink link:calculationLink link:definitionLink 2337306 - Disclosure - Acquisitions (Tables) link:presentationLink link:calculationLink link:definitionLink 2438424 - Disclosure - Acquisitions - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2439425 - Disclosure - Acquisitions - Consideration Transferred (Details) link:presentationLink link:calculationLink link:definitionLink 2440426 - Disclosure - Acquisitions - Purchase Price Allocation (Details) link:presentationLink link:calculationLink link:definitionLink 2441427 - Disclosure - Acquisitions - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2142108 - Disclosure - Goodwill and Intangible Assets link:presentationLink link:calculationLink link:definitionLink 2343307 - Disclosure - Goodwill and Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 2444428 - Disclosure - Goodwill and Intangible Assets - Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 2445429 - Disclosure - Goodwill and Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2446430 - Disclosure - Goodwill and Intangible Assets - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2447431 - Disclosure - Goodwill and Intangible Assets - Future Expected Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 2148109 - Disclosure - Borrowings link:presentationLink link:calculationLink link:definitionLink 2349308 - Disclosure - Borrowings (Tables) link:presentationLink link:calculationLink link:definitionLink 2450432 - Disclosure - Borrowings - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 2451433 - Disclosure - Borrowings - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2452434 - Disclosure - Borrowings - Assets Pledged as Collateral (Details) link:presentationLink link:calculationLink link:definitionLink 2453435 - Disclosure - Borrowings - Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 2154110 - Disclosure - Common Stock and Common Stock Warrants link:presentationLink link:calculationLink link:definitionLink 2355309 - Disclosure - Common Stock and Common Stock Warrants (Tables) link:presentationLink link:calculationLink link:definitionLink 2456436 - Disclosure - Common Stock and Common Stock Warrants - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2457437 - Disclosure - Common Stock and Common Stock Warrants - Reserved Shares of Common Stock for Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 2158111 - Disclosure - Equity Incentive Plans link:presentationLink link:calculationLink link:definitionLink 2359310 - Disclosure - Equity Incentive Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2460438 - Disclosure - Equity Incentive Plans - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2461439 - Disclosure - Equity Incentive Plans - Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2462440 - Disclosure - Equity Incentive Plans - RSU and Restricted Stock Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2463441 - Disclosure - Equity Incentive Plans - Weighted-Average Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 2464442 - Disclosure - Equity Incentive Plans - Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2165112 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 2366311 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 2467443 - Disclosure - Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2468444 - Disclosure - Leases - Lease Liability Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 2468444 - Disclosure - Leases - Lease Liability Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 2469445 - Disclosure - Leases - Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2170113 - Disclosure - Commitment and Contingencies link:presentationLink link:calculationLink link:definitionLink 2471446 - Disclosure - Commitment and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 2172114 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 2473447 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2174115 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 2175116 - Disclosure - Net Income (Loss) Per Share Attributable to Upstart Holdings, Inc. Common Stockholders link:presentationLink link:calculationLink link:definitionLink 2376312 - Disclosure - Net Income (Loss) Per Share Attributable to Upstart Holdings, Inc. Common Stockholders (Tables) link:presentationLink link:calculationLink link:definitionLink 2477448 - Disclosure - Net Income (Loss) Per Share Attributable to Upstart Holdings, Inc. Common Stockholders - Calculation (Details) link:presentationLink link:calculationLink link:definitionLink 2478449 - Disclosure - Net Income (Loss) Per Share Attributable to Upstart Holdings, Inc. Common Stockholders - Antidilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink 2179117 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink