Precision accounting and administrative solutions
From dependable bookkeeping to invoice processing and client portal management, we handle the details so you can focus on growing your business in Fullerton and beyond.
Tailored support for your business
At Keystone Administrative Services, we bring experienced financial organization and administrative clarity to your everyday operations. We adapt seamlessly to your existing workflows to deliver dependable accuracy.
Whether you need ongoing bookkeeping, organized billing structures, or comprehensive customer portal administration, our team provides personalized solutions crafted specifically for your operational goals.
Our service packages
Core financial management
Monthly bookkeeping - Starting at $250/mo
Thorough bank reconciliations, expense categorization, and general ledger maintenance to keep your finances clear.
Invoicing and billing - Starting at $175/mo
Timely client invoice generation, distribution, and systematic tracking to ensure predictable cash flow.
Payment processing - Starting at $150/mo
Secure handling and reconciliation of incoming payments, credit cards, and digital transactions.
Financial reporting - Starting at $125/mo
Clear profit-and-loss statements, balance sheets, and cash flow summaries prepared each month.
Accounts payable management - Starting at $200/mo
Vendor bill tracking, scheduled disbursements, and expense approvals to keep accounts in good standing.
Accounts receivable follow-up - Starting at $175/mo
Professional payment reminders and aging report maintenance to reduce outstanding receivables.
Payroll support - Starting at $195/mo
Accurate payroll calculations, reporting preparation, and record maintenance for small teams.
Tax preparation prep - Starting at $220/project
Year-end cleanups, documented files, and organized statements prepared for your CPA or tax advisor.
Administrative services
Customer portal management - Starting at $180/mo
Regular upkeep, account creations, document uploads, and client access management across software portals.
Data entry and verification - Starting at $120/mo
Precise data transcription, database cleanup, and document archiving to eliminate backlog.
Vendor communication coordination - Starting at $150/mo
Serving as your administrative point of contact for routine billing inquiries and supplier correspondence.
Document organization and archiving - Starting at $140/mo
Digital filing system design, document indexing, and cloud record upkeep for swift retrieval.
Custom tailored support
Workflow optimization - Custom quote
Evaluating current office administrative habits and implementing smoother accounting and billing routines.
Software setup and onboarding - Custom quote
Setting up accounting tools and billing platforms to fit your day-to-day team workflow perfectly.
Ad hoc administrative assistance - Starting at $45/hour
Flexible, on-demand operational help for peak seasons, audits, or sudden administrative overflows.
Executive operational support - Custom quote
Dedicated administrative oversight for business owners who need end-to-end back-office stability.
Built on trust, precision, and consistency
Keystone Administrative Services was founded to give entrepreneurs and growing organizations total peace of mind. By taking billing, bookkeeping, and operational details off your desk, we empower you to lead your business with confidence.
"Keystone completely transformed our billing cycle. Our invoices go out on time every month, and payment processing is seamless. Highly recommended!"
Marcus Vance
"Their attention to detail with bookkeeping and customer portals has saved our team countless hours every single week. True professionals."
Sarah Jenkins
"Prompt, reliable, and deeply knowledgeable. Having Keystone manage our administrative workload lets us focus 100% on serving our clients."
David Alvarez
Ready to streamline your back office?
Schedule a consultation with our experienced specialists to discuss your bookkeeping, billing, and administrative requirements.
Contact us
La Habra, California
United States
Business hours
Monday - Friday: 8:30am - 5:00pm
Saturday: By appointment
Sunday: Closed
Get in touch
(562)453-0826
Connect with us
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